diff --git a/crates/fidc-core/src/futures.rs b/crates/fidc-core/src/futures.rs
new file mode 100644
index 0000000..db159b2
--- /dev/null
+++ b/crates/fidc-core/src/futures.rs
@@ -0,0 +1,347 @@
+use std::collections::BTreeMap;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub enum FuturesDirection {
+    Long,
+    Short,
+}
+
+impl FuturesDirection {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Long => "long",
+            Self::Short => "short",
+        }
+    }
+
+    fn factor(&self) -> f64 {
+        match self {
+            Self::Long => 1.0,
+            Self::Short => -1.0,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct FuturesContractSpec {
+    pub contract_multiplier: f64,
+    pub long_margin_rate: f64,
+    pub short_margin_rate: f64,
+}
+
+impl FuturesContractSpec {
+    pub fn new(contract_multiplier: f64, long_margin_rate: f64, short_margin_rate: f64) -> Self {
+        Self {
+            contract_multiplier: contract_multiplier.max(1.0),
+            long_margin_rate: long_margin_rate.max(0.0),
+            short_margin_rate: short_margin_rate.max(0.0),
+        }
+    }
+
+    pub fn margin_rate(&self, direction: FuturesDirection) -> f64 {
+        match direction {
+            FuturesDirection::Long => self.long_margin_rate,
+            FuturesDirection::Short => self.short_margin_rate,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct FuturesPosition {
+    pub symbol: String,
+    pub direction: FuturesDirection,
+    pub old_quantity: u32,
+    pub quantity: u32,
+    pub avg_price: f64,
+    pub last_price: f64,
+    pub prev_close: f64,
+    pub contract_multiplier: f64,
+    pub margin_rate: f64,
+    pub transaction_cost: f64,
+    trade_quantity_delta: i32,
+    trade_cost: f64,
+}
+
+impl FuturesPosition {
+    pub fn new(
+        symbol: impl Into<String>,
+        direction: FuturesDirection,
+        spec: FuturesContractSpec,
+        init_quantity: u32,
+        init_price: f64,
+    ) -> Self {
+        let margin_rate = spec.margin_rate(direction);
+        Self {
+            symbol: symbol.into(),
+            direction,
+            old_quantity: init_quantity,
+            quantity: init_quantity,
+            avg_price: init_price.max(0.0),
+            last_price: init_price.max(0.0),
+            prev_close: init_price.max(0.0),
+            contract_multiplier: spec.contract_multiplier,
+            margin_rate,
+            transaction_cost: 0.0,
+            trade_quantity_delta: 0,
+            trade_cost: 0.0,
+        }
+    }
+
+    pub fn today_quantity(&self) -> u32 {
+        self.quantity.saturating_sub(self.old_quantity)
+    }
+
+    pub fn market_value(&self) -> f64 {
+        self.quantity as f64 * self.last_price * self.contract_multiplier
+    }
+
+    pub fn margin(&self) -> f64 {
+        self.market_value() * self.margin_rate
+    }
+
+    pub fn equity(&self) -> f64 {
+        (self.last_price - self.avg_price)
+            * self.quantity as f64
+            * self.contract_multiplier
+            * self.direction.factor()
+    }
+
+    pub fn pnl(&self) -> f64 {
+        self.equity()
+    }
+
+    pub fn trading_pnl(&self) -> f64 {
+        (self.trade_quantity_delta as f64 * self.last_price - self.trade_cost)
+            * self.contract_multiplier
+            * self.direction.factor()
+    }
+
+    pub fn position_pnl(&self) -> f64 {
+        if self.old_quantity == 0 {
+            0.0
+        } else {
+            self.old_quantity as f64
+                * (self.last_price - self.prev_close)
+                * self.contract_multiplier
+                * self.direction.factor()
+        }
+    }
+
+    pub fn open(&mut self, quantity: u32, price: f64, transaction_cost: f64) {
+        if quantity == 0 {
+            return;
+        }
+        let old_value = self.avg_price * self.quantity as f64;
+        self.quantity += quantity;
+        self.avg_price = (old_value + price * quantity as f64) / self.quantity as f64;
+        self.last_price = price;
+        self.transaction_cost += transaction_cost.max(0.0);
+        self.trade_quantity_delta += quantity as i32;
+        self.trade_cost += price * quantity as f64;
+    }
+
+    pub fn close(
+        &mut self,
+        quantity: u32,
+        price: f64,
+        transaction_cost: f64,
+    ) -> Result<f64, String> {
+        if quantity > self.quantity {
+            return Err(format!(
+                "close quantity {} exceeds current quantity {} for {} {}",
+                quantity,
+                self.quantity,
+                self.symbol,
+                self.direction.as_str()
+            ));
+        }
+        if quantity == 0 {
+            return Ok(0.0);
+        }
+
+        let realized = (price - self.avg_price)
+            * quantity as f64
+            * self.contract_multiplier
+            * self.direction.factor()
+            - transaction_cost.max(0.0);
+        self.quantity -= quantity;
+        if self.quantity == 0 {
+            self.avg_price = 0.0;
+        }
+        self.last_price = price;
+        self.transaction_cost += transaction_cost.max(0.0);
+        self.trade_quantity_delta -= quantity as i32;
+        self.trade_cost -= price * quantity as f64;
+        Ok(realized)
+    }
+
+    pub fn mark_price(&mut self, price: f64) {
+        if price.is_finite() && price > 0.0 {
+            self.last_price = price;
+        }
+    }
+
+    pub fn begin_trading_day(&mut self) {
+        self.old_quantity = self.quantity;
+        self.prev_close = self.last_price;
+        self.transaction_cost = 0.0;
+        self.trade_quantity_delta = 0;
+        self.trade_cost = 0.0;
+    }
+
+    pub fn settlement(&mut self, settlement_price: f64) -> f64 {
+        self.mark_price(settlement_price);
+        let cash_delta = self.equity();
+        self.avg_price = self.last_price;
+        self.prev_close = self.last_price;
+        cash_delta
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct FuturesAccountState {
+    total_cash: f64,
+    frozen_cash: f64,
+    positions: BTreeMap<(String, FuturesDirection), FuturesPosition>,
+}
+
+impl FuturesAccountState {
+    pub fn new(total_cash: f64) -> Self {
+        Self {
+            total_cash,
+            frozen_cash: 0.0,
+            positions: BTreeMap::new(),
+        }
+    }
+
+    pub fn total_cash(&self) -> f64 {
+        self.total_cash
+    }
+
+    pub fn frozen_cash(&self) -> f64 {
+        self.frozen_cash
+    }
+
+    pub fn cash(&self) -> f64 {
+        self.total_cash - self.margin() - self.frozen_cash
+    }
+
+    pub fn margin(&self) -> f64 {
+        self.positions.values().map(FuturesPosition::margin).sum()
+    }
+
+    pub fn market_value(&self) -> f64 {
+        self.positions
+            .values()
+            .map(FuturesPosition::market_value)
+            .sum()
+    }
+
+    pub fn position_equity(&self) -> f64 {
+        self.positions.values().map(FuturesPosition::equity).sum()
+    }
+
+    pub fn total_value(&self) -> f64 {
+        self.total_cash + self.position_equity()
+    }
+
+    pub fn daily_pnl(&self) -> f64 {
+        self.trading_pnl() + self.position_pnl() - self.transaction_cost()
+    }
+
+    pub fn trading_pnl(&self) -> f64 {
+        self.positions
+            .values()
+            .map(FuturesPosition::trading_pnl)
+            .sum()
+    }
+
+    pub fn position_pnl(&self) -> f64 {
+        self.positions
+            .values()
+            .map(FuturesPosition::position_pnl)
+            .sum()
+    }
+
+    pub fn transaction_cost(&self) -> f64 {
+        self.positions
+            .values()
+            .map(|position| position.transaction_cost)
+            .sum()
+    }
+
+    pub fn positions(&self) -> &BTreeMap<(String, FuturesDirection), FuturesPosition> {
+        &self.positions
+    }
+
+    pub fn position(&self, symbol: &str, direction: FuturesDirection) -> Option<&FuturesPosition> {
+        self.positions.get(&(symbol.to_string(), direction))
+    }
+
+    pub fn open(
+        &mut self,
+        symbol: impl Into<String>,
+        direction: FuturesDirection,
+        spec: FuturesContractSpec,
+        quantity: u32,
+        price: f64,
+        transaction_cost: f64,
+    ) {
+        if quantity == 0 {
+            return;
+        }
+        let symbol = symbol.into();
+        let position = self
+            .positions
+            .entry((symbol.clone(), direction))
+            .or_insert_with(|| FuturesPosition::new(symbol, direction, spec, 0, price));
+        position.open(quantity, price, transaction_cost);
+        self.total_cash -= transaction_cost.max(0.0);
+    }
+
+    pub fn close(
+        &mut self,
+        symbol: &str,
+        direction: FuturesDirection,
+        quantity: u32,
+        price: f64,
+        transaction_cost: f64,
+    ) -> Result<f64, String> {
+        let key = (symbol.to_string(), direction);
+        let position = self
+            .positions
+            .get_mut(&key)
+            .ok_or_else(|| format!("missing futures position {symbol} {}", direction.as_str()))?;
+        let cash_delta = position.close(quantity, price, transaction_cost)?;
+        self.total_cash += cash_delta;
+        if position.quantity == 0 {
+            self.positions.remove(&key);
+        }
+        Ok(cash_delta)
+    }
+
+    pub fn mark_price(&mut self, symbol: &str, direction: FuturesDirection, price: f64) {
+        if let Some(position) = self.positions.get_mut(&(symbol.to_string(), direction)) {
+            position.mark_price(price);
+        }
+    }
+
+    pub fn begin_trading_day(&mut self) {
+        for position in self.positions.values_mut() {
+            position.begin_trading_day();
+        }
+    }
+
+    pub fn settle(&mut self, settlement_prices: &BTreeMap<String, f64>) -> f64 {
+        let mut cash_delta = 0.0;
+        for position in self.positions.values_mut() {
+            let price = settlement_prices
+                .get(&position.symbol)
+                .copied()
+                .unwrap_or(position.last_price);
+            cash_delta += position.settlement(price);
+        }
+        self.total_cash += cash_delta;
+        cash_delta
+    }
+}
diff --git a/crates/fidc-core/src/lib.rs b/crates/fidc-core/src/lib.rs
index 56d72a7..9fe2373 100644
--- a/crates/fidc-core/src/lib.rs
+++ b/crates/fidc-core/src/lib.rs
@@ -5,6 +5,7 @@ pub mod data;
 pub mod engine;
 pub mod event_bus;
 pub mod events;
+pub mod futures;
 pub mod instrument;
 pub mod metrics;
 pub mod platform_expr_strategy;
@@ -32,6 +33,7 @@ pub use events::{
     AccountEvent, FillEvent, OrderEvent, OrderSide, OrderStatus, PositionEvent, ProcessEvent,
     ProcessEventKind,
 };
+pub use futures::{FuturesAccountState, FuturesContractSpec, FuturesDirection, FuturesPosition};
 pub use instrument::Instrument;
 pub use metrics::{BacktestMetrics, compute_backtest_metrics};
 pub use platform_expr_strategy::{
diff --git a/crates/fidc-core/tests/futures_account.rs b/crates/fidc-core/tests/futures_account.rs
new file mode 100644
index 0000000..cd92681
--- /dev/null
+++ b/crates/fidc-core/tests/futures_account.rs
@@ -0,0 +1,52 @@
+use std::collections::BTreeMap;
+
+use fidc_core::{FuturesAccountState, FuturesContractSpec, FuturesDirection};
+
+#[test]
+fn futures_account_tracks_long_margin_pnl_and_settlement() {
+    let spec = FuturesContractSpec::new(300.0, 0.12, 0.14);
+    let mut account = FuturesAccountState::new(1_000_000.0);
+
+    account.open("IF2501", FuturesDirection::Long, spec, 2, 4000.0, 12.0);
+    account.mark_price("IF2501", FuturesDirection::Long, 4010.0);
+
+    assert!((account.total_cash() - 999_988.0).abs() < 1e-6);
+    assert!((account.margin() - 288_720.0).abs() < 1e-6);
+    assert!((account.cash() - 711_268.0).abs() < 1e-6);
+    assert!((account.position_equity() - 6_000.0).abs() < 1e-6);
+    assert!((account.total_value() - 1_005_988.0).abs() < 1e-6);
+
+    let settlement = BTreeMap::from([("IF2501".to_string(), 4020.0)]);
+    let cash_delta = account.settle(&settlement);
+
+    assert!((cash_delta - 12_000.0).abs() < 1e-6);
+    assert!((account.total_cash() - 1_011_988.0).abs() < 1e-6);
+    let position = account
+        .position("IF2501", FuturesDirection::Long)
+        .expect("long position");
+    assert!((position.avg_price - 4020.0).abs() < 1e-6);
+    assert!((position.equity()).abs() < 1e-6);
+}
+
+#[test]
+fn futures_account_tracks_short_close_cash_delta() {
+    let spec = FuturesContractSpec::new(10.0, 0.1, 0.2);
+    let mut account = FuturesAccountState::new(100_000.0);
+
+    account.open("RB2501", FuturesDirection::Short, spec, 5, 3500.0, 3.0);
+    account.mark_price("RB2501", FuturesDirection::Short, 3480.0);
+    assert!((account.margin() - 34_800.0).abs() < 1e-6);
+    assert!((account.position_equity() - 1_000.0).abs() < 1e-6);
+
+    let cash_delta = account
+        .close("RB2501", FuturesDirection::Short, 2, 3470.0, 2.0)
+        .expect("close short");
+
+    assert!((cash_delta - 598.0).abs() < 1e-6);
+    assert!((account.total_cash() - 100_595.0).abs() < 1e-6);
+    let position = account
+        .position("RB2501", FuturesDirection::Short)
+        .expect("remaining short position");
+    assert_eq!(position.quantity, 3);
+    assert!((position.equity() - 900.0).abs() < 1e-6);
+}
diff --git a/docs/rqalpha-gap-roadmap.md b/docs/rqalpha-gap-roadmap.md
index 023dc53..915f59f 100644
--- a/docs/rqalpha-gap-roadmap.md
+++ b/docs/rqalpha-gap-roadmap.md
@@ -85,7 +85,11 @@ current alignment pass.
 - [x] management-fee rate and callback parity
 - [x] stock account map/accessor surface (`accounts`, `stock_account`,
       `account_by_type("STOCK")`)
-- [ ] full futures account, margin, and short-position execution model
+- [x] standalone futures account model with contract multiplier, long/short
+      margin, daily mark-to-market settlement, and short close cashflow
+- [ ] wire futures account into the generic backtest engine runtime
+- [ ] futures order intents, matching, close-today semantics, and expiration
+      settlement
 
 ## Execution Order
 
@@ -103,5 +107,6 @@ current alignment pass.
 
 Active implementation target: continue account parity after exposing the stock
 account runtime view, core Portfolio fields, deposit/withdraw, financing
-liability APIs, management-fee callbacks, and stock account accessors; next gap
-is the full futures account, margin, and short-position execution model.
+liability APIs, management-fee callbacks, stock account accessors, and the
+standalone futures account model; next gap is wiring futures into the generic
+engine runtime and adding futures-specific order matching semantics.