diff --git a/crates/fidc-core/src/daily_patterns.rs b/crates/fidc-core/src/daily_patterns.rs
index a49529f..e59bc8f 100644
--- a/crates/fidc-core/src/daily_patterns.rs
+++ b/crates/fidc-core/src/daily_patterns.rs
@@ -33,6 +33,31 @@ impl PatternSpec {
         if (self.template == "expression") != self.expression.is_some() {
             return Err("expression_template_requires_expression_only".into());
         }
+        if let Some(expr) = &self.expression {
+            let supported = [
+                "open",
+                "high",
+                "low",
+                "close",
+                "volume",
+                "raw_open",
+                "raw_high",
+                "raw_low",
+                "raw_close",
+                "prev_close",
+                "amount",
+            ];
+            let missing = crate::factor_events::field_dependencies(expr)
+                .into_iter()
+                .filter(|f| !supported.contains(&f.as_str()))
+                .collect::<Vec<_>>();
+            if !missing.is_empty() {
+                return Err(format!(
+                    "expression_source_mapping_required: {}",
+                    missing.join(",")
+                ));
+            }
+        }
         let catalog = catalog();
         let definition = catalog["templates"]
             .get(&self.template)
@@ -92,6 +117,10 @@ pub struct PatternBar {
     pub low: Option<f64>,
     pub close: Option<f64>,
     pub volume: Option<f64>,
+    #[serde(default)]
+    pub prev_close: Option<f64>,
+    #[serde(default)]
+    pub amount: Option<f64>,
     pub adjustment_factor_backward1: Option<f64>,
     pub paused: Option<bool>,
     #[serde(default)]
@@ -299,6 +328,37 @@ pub fn evaluate(
                         .collect(),
                 );
             }
+            let needed =
+                crate::factor_events::field_dependencies(spec.expression.as_ref().unwrap());
+            for name in ["prev_close", "amount"] {
+                if !needed.contains(name) {
+                    continue;
+                }
+                let values = days
+                    .iter()
+                    .map(|d| {
+                        let b = by_day[d];
+                        let value = number(
+                            if name == "prev_close" {
+                                b.prev_close
+                            } else {
+                                b.amount
+                            },
+                            &series.symbol,
+                            *d,
+                            name,
+                        )?;
+                        if value < 0.0 || (name == "prev_close" && value == 0.0) {
+                            return Err(format!(
+                                "pattern_input_invalid: {} {d} {name}",
+                                series.symbol
+                            ));
+                        }
+                        Ok(Some(value))
+                    })
+                    .collect::<Result<Vec<_>, String>>()?;
+                fields.insert(name.into(), values);
+            }
             let frame = crate::factor_events::Frame {
                 symbol: series.symbol.clone(),
                 frequency: "1d".into(),
@@ -321,7 +381,7 @@ pub fn evaluate(
                 result.matched = latest == Some(1.0);
                 result
                     .checks
-                    .push(json!({"label":"组合条件","passed":result.matched}));
+                    .push(json!({"label":"组合条件","actual":latest,"operator":"==","threshold":1,"passed":result.matched}));
             } else {
                 return Err("expression_signal_requires_boolean: 数值因子必须显式比较或组合，不能自动视为买卖信号".into());
             }
@@ -491,6 +551,8 @@ pub fn evaluate_dataset(
                 low: Some(b.low),
                 close: Some(b.close),
                 volume: Some(b.volume as f64),
+                prev_close: data.factor_numeric_value(d, symbol, "pre_close"),
+                amount: data.factor_numeric_value(d, symbol, "amount"),
                 adjustment_factor_backward1: data
                     .factor(d, symbol)
                     .and_then(|f| f.adjustment_factor_backward1),
@@ -598,6 +660,8 @@ mod tests {
                         low: Some(p),
                         close: Some(p),
                         volume: Some(100.0),
+                        prev_close: Some(p - 1.0),
+                        amount: Some(p * 100.0),
                         adjustment_factor_backward1: Some(1.0),
                         paused: Some(false),
                         source_path: None,
@@ -608,6 +672,19 @@ mod tests {
         let result = evaluate(&spec, &days, &series).unwrap();
         assert!(result.matched);
         assert_eq!(result.score, Some(1.0));
+        let vwap_spec = make(
+            json!({"kind":"operator","name":"GT","args":[{"kind":"operator","name":"DIV","args":[{"kind":"field","name":"amount"},{"kind":"field","name":"volume"}]},{"kind":"field","name":"prev_close"}]}),
+        );
+        assert!(evaluate(&vwap_spec, &days, &series).unwrap().matched);
+        let mut missing_amount = series.clone();
+        missing_amount.bars[1].amount = None;
+        assert!(
+            evaluate(&vwap_spec, &days, &missing_amount)
+                .unwrap_err()
+                .contains("amount")
+        );
+        let mut missing_previous=series.clone();missing_previous.bars[1].prev_close=None;
+        assert!(evaluate(&vwap_spec,&days,&missing_previous).unwrap_err().contains("prev_close"));
         assert!(
             evaluate(
                 &make(json!({"kind":"field","name":"close"})),
@@ -646,6 +723,8 @@ mod tests {
                     low: Some(c),
                     close: Some(c),
                     volume: Some(1000.0),
+                    prev_close: Some(c - 1.0),
+                    amount: Some(c * 1000.0),
                     adjustment_factor_backward1: Some(1.0),
                     paused: Some(false),
                     source_path: Some("fixture.parquet".into()),
diff --git a/crates/fidc-core/src/factor_events.rs b/crates/fidc-core/src/factor_events.rs
index 7330693..a77237f 100644
--- a/crates/fidc-core/src/factor_events.rs
+++ b/crates/fidc-core/src/factor_events.rs
@@ -11,6 +11,27 @@ use ta_lib::{
 pub const CONTRACT: &str = "fidc_factor_event_expression_v1";
 pub const TA_REV: &str = "dd5a90259a3f9e04e2da9f38bf0719a841b40108";
 
+pub fn field_dependencies(expr: &Expr) -> std::collections::BTreeSet<String> {
+    let mut fields = std::collections::BTreeSet::new();
+    match expr {
+        Expr::Field { name } => {
+            fields.insert(name.clone());
+        }
+        Expr::Indicator { inputs, .. } => {
+            for e in inputs {
+                fields.extend(field_dependencies(e));
+            }
+        }
+        Expr::Operator { args, .. } => {
+            for e in args {
+                fields.extend(field_dependencies(e));
+            }
+        }
+        _ => {}
+    }
+    fields
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "kind", rename_all = "snake_case", deny_unknown_fields)]
 pub enum Expr {