diff --git a/src/devices/cuda/fastllm-cuda.cu b/src/devices/cuda/fastllm-cuda.cu
index 14c9aa68..b273074d 100644
--- a/src/devices/cuda/fastllm-cuda.cu
+++ b/src/devices/cuda/fastllm-cuda.cu
@@ -2620,8 +2620,25 @@ void FastllmCudaClearBigBuffer() {
     for (auto &it : bigBuffersMap) {
         auto &bigBuffers = it.second;
         std::vector <CudaMemoryBuffer> temp;
+        long long littleMemSum = 0;        
+        long long littleMemSumLimit = 300 * 1024 * 1024; // 留一小部分复用
+        std::vector <std::pair <std::size_t, int > > v;
         for (int i = 0; i < bigBuffers.size(); i++) {
             if (!bigBuffers[i].busy) {
+                v.push_back(std::make_pair(bigBuffers[i].size, i));
+            }
+        }
+        sort(v.begin(), v.end());
+        std::set <int> littleMemIds;
+        for (int i = 0; i < v.size(); i++) {
+            littleMemSum += v[i].first;
+            if (littleMemSum > littleMemSumLimit) {
+                break;
+            }
+            littleMemIds.insert(v[i].second);
+        }
+        for (int i = 0; i < bigBuffers.size(); i++) {
+            if (!bigBuffers[i].busy && littleMemIds.find(i) == littleMemIds.end()) {
                 state = cudaSetDevice(it.first);
                 state = cudaFree(bigBuffers[i].data);
                 if (cudaSuccess != state)