diff --git a/csrc/deepep/ops/op_host/cam_moe_combine_normal_tiling.cc b/csrc/deepep/ops/op_host/cam_moe_combine_normal_tiling.cc
index 34071f44d..86952cfd1 100644
--- a/csrc/deepep/ops/op_host/cam_moe_combine_normal_tiling.cc
+++ b/csrc/deepep/ops/op_host/cam_moe_combine_normal_tiling.cc
@@ -530,19 +530,20 @@ static ge::graphStatus CamMoeCombineNormalA3TilingFuncImpl(gert::TilingContext *
     uint64_t epWorldSize = static_cast<uint64_t>(tilingData->camMoeCombineNormalInfo.epWorldSize);
     uint64_t k = static_cast<uint64_t>(tilingData->camMoeCombineNormalInfo.k);
     uint64_t perRoundTokens = tilingData->camMoeCombineNormalInfo.perRoundTokens;
+    uint64_t realMaxBs = tilingData->camMoeCombineNormalInfo.realMaxBs;
+    uint64_t realBs = std::min(perRoundTokens, realMaxBs);
     // combine数据区 token首地址对齐512
     uint64_t tokenNeedSizeCombine = ((h * MAX_OUT_DTYPE_SIZE + WIN_ADDR_ALIGN - 1UL) / WIN_ADDR_ALIGN) * WIN_ADDR_ALIGN;
-    uint64_t actualSize =
-        (perRoundTokens * k * tokenNeedSizeCombine + COMBINE_STATE_WIN_OFFSET + NOTIFY_DISPATCH_WIN_OFFSET) *
-        DOUBLE_DATA_BUFFER;
+    uint64_t actualSize = (realBs * k * tokenNeedSizeCombine + COMBINE_STATE_WIN_OFFSET + NOTIFY_DISPATCH_WIN_OFFSET) *
+                          DOUBLE_DATA_BUFFER;
     OP_TILING_CHECK(
         (actualSize > maxWindowSize),
         OP_LOGE(nodeName,
-                "HCCL_BUFFSIZE is too SMALL, perRoundTokens = %lu, h = %lu, epWorldSize = %lu, localMoeExpertNum = %u,"
+                "HCCL_BUFFSIZE is too SMALL, realBs = %lu, h = %lu, epWorldSize = %lu, localMoeExpertNum = %u,"
                 " tokenNeedSizeCombine = %lu, k = %lu, NEEDED_HCCL_BUFFSIZE("
                 "((perRoundTokens * k * tokenNeedSizeCombine)) + 8MB + 102MB) * 2) = %luMB, "
                 "HCCL_BUFFSIZE=%luMB.",
-                perRoundTokens, h, epWorldSize, localMoeExpertNum, tokenNeedSizeCombine, k, actualSize / MB_SIZE + 1UL,
+                realBs, h, epWorldSize, localMoeExpertNum, tokenNeedSizeCombine, k, actualSize / MB_SIZE + 1UL,
                 maxWindowSize / MB_SIZE),
         return ge::GRAPH_FAILED);
     tilingData->camMoeCombineNormalInfo.totalWinSize = maxWindowSize;