diff --git a/crates/fidc-core/src/data.rs b/crates/fidc-core/src/data.rs
index 177e41b..04ff857 100644
--- a/crates/fidc-core/src/data.rs
+++ b/crates/fidc-core/src/data.rs
@@ -1326,6 +1326,7 @@ pub struct DataSet {
     benchmark_series_cache: Arc<BenchmarkPriceSeries>,
     symbol_id_by_code: Arc<AHashMap<String, u32>>,
     symbol_by_id: Arc<Vec<Arc<str>>>,
+    symbol_is_bjse_by_id: Arc<Vec<bool>>,
     eligible_universe_by_date: Arc<OnceLock<BTreeMap<NaiveDate, Vec<EligibleUniverseSnapshot>>>>,
     benchmark_code: String,
     futures_params_by_symbol: Arc<HashMap<String, Vec<FuturesTradingParameter>>>,
@@ -1774,6 +1775,10 @@ impl DataSet {
         for (symbol, symbol_id) in &symbol_id_by_code {
             symbol_by_id[*symbol_id as usize] = Arc::<str>::from(symbol.as_str());
         }
+        let symbol_is_bjse_by_id = symbol_by_id
+            .iter()
+            .map(|symbol| symbol_is_bjse(symbol))
+            .collect::<Vec<_>>();
         let mut instruments_by_symbol_id = vec![None; symbol_id_by_code.len()];
         for (symbol, instrument) in &instruments {
             if let Some(symbol_id) = symbol_id_by_code.get(symbol).copied() {
@@ -1863,6 +1868,7 @@ impl DataSet {
             benchmark_series_cache: Arc::new(benchmark_series_cache),
             symbol_id_by_code: Arc::new(symbol_id_by_code),
             symbol_by_id: Arc::new(symbol_by_id),
+            symbol_is_bjse_by_id: Arc::new(symbol_is_bjse_by_id),
             eligible_universe_by_date: Arc::new(OnceLock::new()),
             benchmark_code,
             futures_params_by_symbol: Arc::new(futures_params_by_symbol),
@@ -1921,6 +1927,13 @@ impl DataSet {
         (!symbol.is_empty()).then(|| Arc::clone(symbol))
     }
 
+    pub(crate) fn symbol_is_bjse_by_id(&self, symbol_id: u32) -> bool {
+        self.symbol_is_bjse_by_id
+            .get(symbol_id as usize)
+            .copied()
+            .unwrap_or(false)
+    }
+
     pub(crate) fn symbol_count(&self) -> usize {
         self.symbol_id_by_code.len()
     }
@@ -4087,6 +4100,18 @@ fn normalized_field(field: &str) -> Cow<'_, str> {
     }
 }
 
+pub(crate) fn symbol_is_bjse(symbol: &str) -> bool {
+    let normalized = symbol.trim();
+    normalized
+        .get(normalized.len().saturating_sub(3)..)
+        .is_some_and(|suffix| {
+            suffix.eq_ignore_ascii_case(".BJ") || suffix.eq_ignore_ascii_case(".BE")
+        })
+        || normalized
+            .get(normalized.len().saturating_sub(4)..)
+            .is_some_and(|suffix| suffix.eq_ignore_ascii_case(".BSE"))
+}
+
 fn normalize_factor_snapshots(factors: Vec<DailyFactorSnapshot>) -> Vec<DailyFactorSnapshot> {
     factors
         .into_iter()
diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index 6a41155..db6844f 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -4284,7 +4284,7 @@ impl PlatformExprStrategy {
             is_st: candidate.is_st,
             is_star_st: candidate.is_star_st,
             is_kcb: candidate.is_kcb,
-            is_bjse: Self::symbol_is_bjse(symbol),
+            is_bjse: ctx.data.symbol_is_bjse_by_id(symbol_id),
             is_one_yuan: candidate.is_one_yuan || market.day_open <= 1.0,
             is_new_listing: candidate.is_new_listing,
             allow_buy: candidate.allow_buy,
@@ -9533,18 +9533,6 @@ impl PlatformExprStrategy {
         None
     }
 
-    fn symbol_is_bjse(symbol: &str) -> bool {
-        let normalized = symbol.trim();
-        normalized
-            .get(normalized.len().saturating_sub(3)..)
-            .is_some_and(|suffix| {
-                suffix.eq_ignore_ascii_case(".BJ") || suffix.eq_ignore_ascii_case(".BE")
-            })
-            || normalized
-                .get(normalized.len().saturating_sub(4)..)
-                .is_some_and(|suffix| suffix.eq_ignore_ascii_case(".BSE"))
-    }
-
     fn stock_numeric_field_value(
         &self,
         candidate: &EligibleUniverseSnapshot,
@@ -12912,12 +12900,12 @@ mod tests {
 
     #[test]
     fn bjse_symbol_detection_is_case_insensitive_without_normalizing_all_symbols() {
-        assert!(PlatformExprStrategy::symbol_is_bjse("920508.BJ"));
-        assert!(PlatformExprStrategy::symbol_is_bjse(" 920508.bj "));
-        assert!(PlatformExprStrategy::symbol_is_bjse("430001.BSE"));
-        assert!(PlatformExprStrategy::symbol_is_bjse("430001.be"));
-        assert!(!PlatformExprStrategy::symbol_is_bjse("688001.SH"));
-        assert!(!PlatformExprStrategy::symbol_is_bjse("BJ"));
+        assert!(crate::data::symbol_is_bjse("920508.BJ"));
+        assert!(crate::data::symbol_is_bjse(" 920508.bj "));
+        assert!(crate::data::symbol_is_bjse("430001.BSE"));
+        assert!(crate::data::symbol_is_bjse("430001.be"));
+        assert!(!crate::data::symbol_is_bjse("688001.SH"));
+        assert!(!crate::data::symbol_is_bjse("BJ"));
     }
 
     #[test]
diff --git a/crates/fidc-core/src/risk_control.rs b/crates/fidc-core/src/risk_control.rs
index 47f7f35..2107ce0 100644
--- a/crates/fidc-core/src/risk_control.rs
+++ b/crates/fidc-core/src/risk_control.rs
@@ -4,7 +4,7 @@ use chrono::NaiveDate;
 use serde::{Deserialize, Serialize};
 
 use crate::OrderSide;
-use crate::data::{CandidateEligibility, DailyMarketSnapshot, PriceField};
+use crate::data::{CandidateEligibility, DailyMarketSnapshot, PriceField, symbol_is_bjse};
 use crate::instrument::Instrument;
 use crate::portfolio::Position;
 
@@ -602,11 +602,6 @@ fn symbol_is_kcb(symbol: &str) -> bool {
     (normalized.starts_with("688") || normalized.starts_with("689")) && normalized.ends_with(".SH")
 }
 
-fn symbol_is_bjse(symbol: &str) -> bool {
-    let normalized = symbol.trim().to_ascii_uppercase();
-    normalized.ends_with(".BJ") || normalized.ends_with(".BSE") || normalized.ends_with(".BE")
-}
-
 fn candidate_active_status_rejection(
     candidate: &CandidateEligibility,
     config: &FidcRiskControlConfig,