diff --git a/csrc/dispatch_ffn_combine/op_host/dispatch_ffn_combine_tiling.cpp b/csrc/dispatch_ffn_combine/op_host/dispatch_ffn_combine_tiling.cpp
index 90b3c45e..8b16f0b9 100644
--- a/csrc/dispatch_ffn_combine/op_host/dispatch_ffn_combine_tiling.cpp
+++ b/csrc/dispatch_ffn_combine/op_host/dispatch_ffn_combine_tiling.cpp
@@ -26,6 +26,8 @@
 using namespace AscendC;
 using namespace ge;
 
+#define HCCL_BUFFSIZE  "HCCL_BUFFSIZE"
+
 namespace {
     // 1. Constant definitions
     const char *K_INNER_DEBUG = "DispatchFFNCombine Tiling Debug";
@@ -42,6 +44,7 @@ namespace {
     constexpr uint32_t EXPERTID_INDEX = 3;
     constexpr uint32_t BLOCK_NUM = 20;
     constexpr uint32_t SYSTEM_NEED_WORKSPACE = 16 * 1024 * 1024;
+    constexpr uint64_t MB_SIZE = 1024 * 1024UL;
 }
 
 namespace optiling {
@@ -54,6 +57,30 @@ static int32_t CeilDev(int32_t num, int32_t div)
     return (num + div - 1) / div;
 }
 
+static uint64_t GetMaxWindowSize()
+{
+    uint16_t defaultWindowSize = 200;
+    const char* hccl_buffsize_env = getenv(HCCL_BUFFSIZE);
+    if (hccl_buffsize_env != nullptr) {
+        try {
+            std::string envStr(hccl_buffsize_env);
+            unsigned long val = std::stoul(envStr);
+            if (val <= std::numeric_limits<uint16_t>::max()) {
+                defaultWindowSize = static_cast<uint16_t>(val);
+            } else {
+                OP_LOGW(K_INNER_DEBUG, "HCCL_BUFFSIZE value %lu is out of range, using default.", val);
+            }
+        } catch (const std::exception& e) {
+            OP_LOGE(K_INNER_DEBUG, "Exception encountered when parsing env HCCL_BUFFSIZE: %s", e.what());
+        }
+    } else {
+        OP_LOGD(K_INNER_DEBUG, "Env HCCL_BUFFSIZE not set");
+    }
+    const uint64_t maxWindowSize = static_cast<uint64_t>(defaultWindowSize) * MB_SIZE;
+    OP_LOGD(K_INNER_DEBUG, "Get maxWindowSize is %lu", maxWindowSize);
+    return maxWindowSize;
+}
+
 // Parse and validate rankId, group, worldSize, and isTransB attributes
 static ge::graphStatus DispatchFFNCombineCheckAttrAndSetTiling(gert::TilingContext *context, DispatchFFNCombineInfo& info)
 {
@@ -232,6 +259,14 @@ static ge::graphStatus DispatchFFNCombineTilingFuncImpl(gert::TilingContext *con
     tilingData->cocTiling.moeInitRoutingQuantV2TilingData.gatherOutComputeParamsOp = moeInitRoutingQuantV2TilingBase.quantTilingData.gatherOutComputeParamsOp;
     tilingData->cocTiling.initRoutingQuantTilingKey = initRoutingQuantTilingKey;
 
+    uint64_t maxWindowSize = GetMaxWindowSize();
+    uint64_t actualSize = static_cast<uint64_t>(info.M) * info.topK * info.K * sizeof(int8_t) * 3 + 10 * MB_SIZE ;
+    OP_TILING_CHECK((actualSize > maxWindowSize),
+        OP_LOGE(nodeName, "HCCL_BUFFSIZE is too SMALL, m = %lu, k = %lu, topK = %lu"
+            " expected HCCL_BUFFSIZE is ((m * k * topK * sizeof(int8_t)) * 3 + 3MB)= %luMB, HCCL_BUFFSIZE=%luMB.",
+            info.M, info.K, info.topK, (actualSize + MB_SIZE - 1) / MB_SIZE, maxWindowSize / MB_SIZE),
+        return ge::GRAPH_FAILED);
+
     // 4. workspace
     size_t *workSpaces = context->GetWorkspaceSizes(1);
     OP_TILING_CHECK(workSpaces == nullptr, OP_LOGE(nodeName, "workSpaces is nullptr."),