From bf457d94ce5a085effb0c575dc5a2acdc393bd4c Mon Sep 17 00:00:00 2001
From: boris <shuaibo.zhang@hotmail.com>
Date: Sat, 4 Jul 2026 11:21:00 +0800
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---
 crates/fidc-core/src/risk_control.rs | 41 ++++++++++++++++++++++------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/crates/fidc-core/src/risk_control.rs b/crates/fidc-core/src/risk_control.rs
index c153965..353e801 100644
--- a/crates/fidc-core/src/risk_control.rs
+++ b/crates/fidc-core/src/risk_control.rs
@@ -342,14 +342,6 @@ impl ChinaAShareRiskControl {
         if reject_paused && (market.paused || candidate.is_paused) {
             return Some("paused");
         }
-        let reject_st = match scope {
-            RiskCheckScope::Selection => config.static_rules.reject_st_selection,
-            RiskCheckScope::Buy => config.static_rules.reject_st_buy,
-            RiskCheckScope::Sell => false,
-        };
-        if reject_st && candidate.is_st {
-            return Some("st");
-        }
         let reject_star_st = match scope {
             RiskCheckScope::Selection => config.static_rules.reject_star_st_selection,
             RiskCheckScope::Buy => config.static_rules.reject_star_st_buy,
@@ -358,6 +350,14 @@ impl ChinaAShareRiskControl {
         if reject_star_st && candidate.is_star_st {
             return Some("star_st");
         }
+        let reject_st = match scope {
+            RiskCheckScope::Selection => config.static_rules.reject_st_selection,
+            RiskCheckScope::Buy => config.static_rules.reject_st_buy,
+            RiskCheckScope::Sell => false,
+        };
+        if reject_st && candidate.is_st && !candidate.is_star_st {
+            return Some("st");
+        }
         let reject_new_listing = match scope {
             RiskCheckScope::Selection => config.static_rules.reject_new_listing_selection,
             RiskCheckScope::Buy => config.static_rules.reject_new_listing_buy,
@@ -877,6 +877,10 @@ mod tests {
         let mut star_st_candidate = candidate(date);
         star_st_candidate.is_star_st = true;
         star_st_candidate.allow_sell = true;
+        let mut overlapping_star_st_candidate = candidate(date);
+        overlapping_star_st_candidate.is_st = true;
+        overlapping_star_st_candidate.is_star_st = true;
+        overlapping_star_st_candidate.allow_sell = true;
 
         let mut config = FidcRiskControlConfig::default();
         config.static_rules.reject_st_selection = false;
@@ -904,6 +908,16 @@ mod tests {
             ),
             Some("star_st")
         );
+        assert_eq!(
+            ChinaAShareRiskControl::selection_rejection_reason_with_config(
+                date,
+                &overlapping_star_st_candidate,
+                &market,
+                None,
+                &config,
+            ),
+            Some("star_st")
+        );
 
         config.static_rules.reject_st_selection = true;
         config.static_rules.reject_st_buy = true;
@@ -932,6 +946,17 @@ mod tests {
             ),
             None
         );
+        assert_eq!(
+            ChinaAShareRiskControl::buy_rejection_reason_with_config(
+                date,
+                &overlapping_star_st_candidate,
+                &market,
+                None,
+                6.27,
+                &config,
+            ),
+            None
+        );
     }
 
     #[test]