diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index ec8b3f2..865ac02 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -208,8 +208,13 @@ pub struct PlatformExprStrategyConfig {
     pub retry_empty_rebalance: bool,
     pub calendar_rebalance_interval: bool,
     pub aiquant_transaction_cost: bool,
+    pub commission_rate: Option<f64>,
+    pub minimum_commission: Option<f64>,
+    pub stamp_tax_rate_before_change: Option<f64>,
+    pub stamp_tax_rate_after_change: Option<f64>,
     pub strict_value_budget: bool,
     pub quote_quantity_limit: bool,
+    pub current_day_precomputed_factors: bool,
     pub intraday_execution_time: Option<NaiveTime>,
     pub explicit_action_stage: PlatformExplicitActionStage,
     pub explicit_action_schedule: Option<PlatformRebalanceSchedule>,
@@ -266,8 +271,13 @@ fn band_low(index_close) {
             retry_empty_rebalance: false,
             calendar_rebalance_interval: false,
             aiquant_transaction_cost: false,
+            commission_rate: None,
+            minimum_commission: None,
+            stamp_tax_rate_before_change: None,
+            stamp_tax_rate_after_change: None,
             strict_value_budget: false,
             quote_quantity_limit: true,
+            current_day_precomputed_factors: false,
             intraday_execution_time: None,
             explicit_action_stage: PlatformExplicitActionStage::OnDay,
             explicit_action_schedule: None,
@@ -879,11 +889,24 @@ impl PlatformExprStrategy {
     }
 
     fn cost_model(&self) -> ChinaAShareCostModel {
-        if self.config.aiquant_transaction_cost {
+        let mut model = if self.config.aiquant_transaction_cost {
             ChinaAShareCostModel::aiquant_rqalpha_default()
         } else {
             ChinaAShareCostModel::default()
+        };
+        if let Some(value) = self.config.commission_rate {
+            model.commission_rate = value;
         }
+        if let Some(value) = self.config.minimum_commission {
+            model.minimum_commission = value;
+        }
+        if let Some(value) = self.config.stamp_tax_rate_before_change {
+            model.stamp_tax_rate_before_change = value;
+        }
+        if let Some(value) = self.config.stamp_tax_rate_after_change {
+            model.stamp_tax_rate_after_change = value;
+        }
+        model
     }
 
     fn marked_total_value(&self, ctx: &StrategyContext<'_>, date: NaiveDate) -> f64 {
@@ -4007,14 +4030,16 @@ impl PlatformExprStrategy {
         Ok(value.round().max(1.0) as usize)
     }
 
-    fn selection_dates(&self, ctx: &StrategyContext<'_>) -> (NaiveDate, NaiveDate) {
+    fn selection_dates(&self, ctx: &StrategyContext<'_>) -> (NaiveDate, NaiveDate, NaiveDate) {
         let decision_date = ctx.decision_date;
-        let factor_date = if self.config.aiquant_transaction_cost {
+        let previous_factor_date = ctx
+            .data
+            .previous_trading_date(decision_date, 1)
+            .unwrap_or(decision_date);
+        let stock_factor_date = if self.config.current_day_precomputed_factors {
             decision_date
         } else {
-            ctx.data
-                .previous_trading_date(decision_date, 1)
-                .unwrap_or(decision_date)
+            previous_factor_date
         };
         let selection_date = if self.config.aiquant_transaction_cost
             && self.config.intraday_execution_time.is_some()
@@ -4023,7 +4048,7 @@ impl PlatformExprStrategy {
         } else {
             decision_date
         };
-        (selection_date, factor_date)
+        (selection_date, previous_factor_date, stock_factor_date)
     }
 
     fn buy_scale(
@@ -5138,6 +5163,13 @@ impl PlatformExprStrategy {
         candidate: &EligibleUniverseSnapshot,
         stock: &StockExpressionState,
     ) -> f64 {
+        match self.config.market_cap_field.as_str() {
+            "market_cap" | "market_cap_bn" => return candidate.market_cap_bn,
+            "free_float_cap" | "free_float_market_cap" | "free_float_cap_bn" => {
+                return candidate.free_float_cap_bn;
+            }
+            _ => {}
+        }
         self.stock_numeric_field_value(candidate, stock, self.config.market_cap_field.as_str())
             .unwrap_or_else(|| self.field_value(candidate))
     }
@@ -5236,18 +5268,19 @@ impl PlatformExprStrategy {
         &self,
         ctx: &StrategyContext<'_>,
         date: NaiveDate,
-        factor_date: NaiveDate,
+        universe_factor_date: NaiveDate,
+        stock_factor_date: NaiveDate,
         day: &DayExpressionState,
         band_low: f64,
         band_high: f64,
         limit: usize,
     ) -> Result<(Vec<String>, Vec<String>), BacktestError> {
-        let universe = self.selectable_universe_on(ctx, date, factor_date);
+        let universe = self.selectable_universe_on(ctx, date, universe_factor_date);
         let mut diagnostics = Vec::new();
         let mut candidates = Vec::new();
         for candidate in universe {
             let stock =
-                self.stock_state_with_factor_date(ctx, date, factor_date, &candidate.symbol)?;
+                self.stock_state_with_factor_date(ctx, date, stock_factor_date, &candidate.symbol)?;
             let field_value = self.selection_field_value(&candidate, &stock);
             if !field_value.is_finite() {
                 if diagnostics.len() < 12 {
@@ -5341,19 +5374,20 @@ impl PlatformExprStrategy {
         &self,
         ctx: &StrategyContext<'_>,
         date: NaiveDate,
-        factor_date: NaiveDate,
+        universe_factor_date: NaiveDate,
+        stock_factor_date: NaiveDate,
         day: &DayExpressionState,
         band_low: f64,
         band_high: f64,
         selection_limit: usize,
     ) -> Result<(Vec<String>, Vec<String>, Vec<String>), BacktestError> {
-        let universe = self.selectable_universe_on(ctx, date, factor_date);
+        let universe = self.selectable_universe_on(ctx, date, universe_factor_date);
         let mut diagnostics = Vec::new();
         let mut candidates = Vec::new();
         let apply_stock_filter = !self.stock_filter_uses_intraday_quote_fields();
         for candidate in universe {
             let stock =
-                self.stock_state_with_factor_date(ctx, date, factor_date, &candidate.symbol)?;
+                self.stock_state_with_factor_date(ctx, date, stock_factor_date, &candidate.symbol)?;
             let field_value = self.selection_field_value(&candidate, &stock);
             if !field_value.is_finite() {
                 if diagnostics.len() < 12 {
@@ -5406,7 +5440,8 @@ impl PlatformExprStrategy {
                 processed_symbols.push(symbol.clone());
             }
             for (symbol, _) in &candidates[cursor..end] {
-                let stock = self.stock_state_with_factor_date(ctx, date, factor_date, symbol)?;
+                let stock =
+                    self.stock_state_with_factor_date(ctx, date, stock_factor_date, symbol)?;
                 if let Some(reason) = self.buy_rejection_reason(ctx, date, symbol, &stock)? {
                     if diagnostics.len() < 12 {
                         diagnostics.push(format!("{symbol} quote_plan rejected by {reason}"));
@@ -5453,7 +5488,7 @@ impl PlatformExprStrategy {
         }
 
         let day = self.day_state(ctx, ctx.decision_date)?;
-        let (selection_date, factor_date) = self.selection_dates(ctx);
+        let (selection_date, universe_factor_date, stock_factor_date) = self.selection_dates(ctx);
         let requires_intraday_selection_quotes = self.stock_filter_uses_intraday_quote_fields();
         let (band_low, band_high) = self.market_cap_band(ctx, &day)?;
         let selection_limit = self
@@ -5462,7 +5497,8 @@ impl PlatformExprStrategy {
         let (candidate_symbols, order_symbols, diagnostics) = self.select_quote_plan_symbols(
             ctx,
             selection_date,
-            factor_date,
+            universe_factor_date,
+            stock_factor_date,
             &day,
             band_low,
             band_high,
@@ -5472,7 +5508,7 @@ impl PlatformExprStrategy {
             execution_date: ctx.execution_date,
             decision_date: ctx.decision_date,
             selection_date,
-            factor_date,
+            factor_date: stock_factor_date,
             requires_intraday_selection_quotes,
             band_low,
             band_high,
@@ -5658,7 +5694,8 @@ impl Strategy for PlatformExprStrategy {
         }
 
         let day = self.day_state(ctx, decision_date)?;
-        let (selection_market_date, selection_factor_date) = self.selection_dates(ctx);
+        let (selection_market_date, selection_universe_factor_date, selection_factor_date) =
+            self.selection_dates(ctx);
         let (explicit_action_intents, explicit_action_diagnostics) =
             if self.config.explicit_action_stage == PlatformExplicitActionStage::OnDay
                 && self.explicit_actions_active(ctx.data.calendar(), execution_date)
@@ -5696,6 +5733,7 @@ impl Strategy for PlatformExprStrategy {
             let (stock_list, notes) = self.select_symbols(
                 ctx,
                 selection_market_date,
+                selection_universe_factor_date,
                 selection_factor_date,
                 &day,
                 band_low,
@@ -6207,7 +6245,7 @@ impl Strategy for PlatformExprStrategy {
                 )
             },
             format!(
-                "selected={} periodic_rebalance={} exits={} projected_positions={} intents={} limit={} decision_date={} selection_market_date={} selection_factor_date={} execution_date={} budget_total={:.2} marked_total={:.2} day_total={:.2}",
+                "selected={} periodic_rebalance={} exits={} projected_positions={} intents={} limit={} decision_date={} selection_market_date={} selection_universe_factor_date={} selection_factor_date={} execution_date={} budget_total={:.2} marked_total={:.2} day_total={:.2}",
                 stock_list.len(),
                 periodic_rebalance,
                 exit_symbols.len(),
@@ -6216,6 +6254,7 @@ impl Strategy for PlatformExprStrategy {
                 selection_limit,
                 decision_date,
                 selection_market_date,
+                selection_universe_factor_date,
                 selection_factor_date,
                 execution_date,
                 aiquant_total_value,
@@ -6331,6 +6370,18 @@ mod tests {
         ));
     }
 
+    #[test]
+    fn platform_expr_cost_model_uses_commission_override() {
+        let mut cfg = PlatformExprStrategyConfig::microcap_rotation();
+        cfg.aiquant_transaction_cost = true;
+        cfg.commission_rate = Some(0.0003);
+        cfg.minimum_commission = Some(5.0);
+        let strategy = PlatformExprStrategy::new(cfg);
+
+        assert!((strategy.buy_commission(100_000.0) - 30.0).abs() < 1e-9);
+        assert!((strategy.buy_commission(1_000.0) - 5.0).abs() < 1e-9);
+    }
+
     #[test]
     fn platform_expr_rewrites_prelude_assignment_ternary() {
         let prelude = "let cap_low = sig_close <= 0 ? 7 : max(5, min(cap_low_raw, 70));";
@@ -7404,7 +7455,7 @@ mod tests {
 
         let day = strategy.day_state(&ctx, date).expect("day state");
         let (selected, _) = strategy
-            .select_symbols(&ctx, date, date, &day, 10.0, 20.0, 1)
+            .select_symbols(&ctx, date, date, date, &day, 10.0, 20.0, 1)
             .expect("selection");
         assert!(selected.is_empty());
     }
@@ -7908,6 +7959,14 @@ mod tests {
             "{:?}",
             decision.diagnostics
         );
+        assert!(
+            decision
+                .diagnostics
+                .iter()
+                .any(|item| item.contains("selection_factor_date=2023-11-10")),
+            "{:?}",
+            decision.diagnostics
+        );
         assert!(
             decision
                 .diagnostics
diff --git a/crates/fidc-core/src/platform_strategy_spec.rs b/crates/fidc-core/src/platform_strategy_spec.rs
index a51be9d..cbbda04 100644
--- a/crates/fidc-core/src/platform_strategy_spec.rs
+++ b/crates/fidc-core/src/platform_strategy_spec.rs
@@ -67,6 +67,14 @@ pub struct StrategyExecutionSpec {
     #[serde(default)]
     pub slippage_max_value: Option<f64>,
     #[serde(default)]
+    pub commission_rate: Option<f64>,
+    #[serde(default)]
+    pub minimum_commission: Option<f64>,
+    #[serde(default)]
+    pub stamp_tax_rate_before_change: Option<f64>,
+    #[serde(default)]
+    pub stamp_tax_rate_after_change: Option<f64>,
+    #[serde(default)]
     pub strict_value_budget: Option<bool>,
 }
 
@@ -108,6 +116,14 @@ pub struct StrategyEngineConfig {
     #[serde(default)]
     pub slippage_max_value: Option<f64>,
     #[serde(default)]
+    pub commission_rate: Option<f64>,
+    #[serde(default)]
+    pub minimum_commission: Option<f64>,
+    #[serde(default)]
+    pub stamp_tax_rate_before_change: Option<f64>,
+    #[serde(default)]
+    pub stamp_tax_rate_after_change: Option<f64>,
+    #[serde(default)]
     pub strict_value_budget: Option<bool>,
     #[serde(default)]
     pub dividend_reinvestment: Option<bool>,
@@ -343,6 +359,31 @@ pub fn platform_expr_config_from_value(
     ))
 }
 
+fn valid_non_negative(value: Option<f64>) -> Option<f64> {
+    value.filter(|item| item.is_finite() && *item >= 0.0)
+}
+
+fn apply_cost_overrides(
+    cfg: &mut PlatformExprStrategyConfig,
+    commission_rate: Option<f64>,
+    minimum_commission: Option<f64>,
+    stamp_tax_rate_before_change: Option<f64>,
+    stamp_tax_rate_after_change: Option<f64>,
+) {
+    if let Some(value) = valid_non_negative(commission_rate) {
+        cfg.commission_rate = Some(value);
+    }
+    if let Some(value) = valid_non_negative(minimum_commission) {
+        cfg.minimum_commission = Some(value);
+    }
+    if let Some(value) = valid_non_negative(stamp_tax_rate_before_change) {
+        cfg.stamp_tax_rate_before_change = Some(value);
+    }
+    if let Some(value) = valid_non_negative(stamp_tax_rate_after_change) {
+        cfg.stamp_tax_rate_after_change = Some(value);
+    }
+}
+
 pub fn platform_expr_config_from_spec(
     strategy_id: &str,
     signal_symbol: &str,
@@ -440,6 +481,13 @@ pub fn platform_expr_config_from_spec(
         {
             cfg.benchmark_symbol = spec_benchmark_symbol.clone();
         }
+        apply_cost_overrides(
+            &mut cfg,
+            engine.commission_rate,
+            engine.minimum_commission,
+            engine.stamp_tax_rate_before_change,
+            engine.stamp_tax_rate_after_change,
+        );
     }
 
     if let Some(spec_signal_symbol) = spec
@@ -741,6 +789,15 @@ pub fn platform_expr_config_from_spec(
     {
         cfg.aiquant_transaction_cost = true;
     }
+    if let Some(execution) = spec.execution.as_ref() {
+        apply_cost_overrides(
+            &mut cfg,
+            execution.commission_rate,
+            execution.minimum_commission,
+            execution.stamp_tax_rate_before_change,
+            execution.stamp_tax_rate_after_change,
+        );
+    }
 
     cfg
 }
@@ -1169,6 +1226,30 @@ mod tests {
         );
     }
 
+    #[test]
+    fn parses_execution_cost_overrides_into_platform_config() {
+        let spec = serde_json::json!({
+            "execution": {
+                "compatibilityProfile": "aiquant_rqalpha",
+                "commissionRate": 0.0003,
+                "minimumCommission": 5.0,
+                "stampTaxRateBeforeChange": 0.0005,
+                "stampTaxRateAfterChange": 0.0005
+            },
+            "engineConfig": {
+                "commissionRate": 0.0008
+            }
+        });
+
+        let cfg = platform_expr_config_from_value("", "", &spec).expect("config");
+
+        assert!(cfg.aiquant_transaction_cost);
+        assert_eq!(cfg.commission_rate, Some(0.0003));
+        assert_eq!(cfg.minimum_commission, Some(5.0));
+        assert_eq!(cfg.stamp_tax_rate_before_change, Some(0.0005));
+        assert_eq!(cfg.stamp_tax_rate_after_change, Some(0.0005));
+    }
+
     #[test]
     fn parses_daily_schedule_time_for_aiquant_execution_quotes() {
         let spec = serde_json::json!({