diff --git a/lnp_ml/modeling/benchmark.py b/lnp_ml/modeling/benchmark.py
index 44ba209..d023170 100644
--- a/lnp_ml/modeling/benchmark.py
+++ b/lnp_ml/modeling/benchmark.py
@@ -372,6 +372,8 @@ def main(
             df = pd.read_parquet(fold_dir / f"{split}.parquet")
             all_smiles.update(df["smiles"].tolist())
     
+    rdkit_cache = None  # 跨 fold 共享 RDKit 特征缓存
+    
     for fold_dir in fold_dirs:
         fold_idx = int(fold_dir.name.split("_")[1])
         
@@ -406,9 +408,13 @@ def main(
         )
         model = model.to(device)
         
-        # 第一个 fold 时做 cache warmup
-        if fold_idx == 0:
+        # 第一个 fold 时做 cache warmup，之后复用缓存
+        if rdkit_cache is None:
             warmup_cache(model, list(all_smiles), batch_size=256)
+            rdkit_cache = model.rdkit_encoder._cache
+        else:
+            model.rdkit_encoder._cache = rdkit_cache
+            logger.info(f"Reusing RDKit cache with {len(rdkit_cache)} entries")
         
         logger.info(f"Model parameters: {sum(p.numel() for p in model.parameters()):,}")