diff --git a/cpp/src/db/ExecutionEngine.h b/cpp/src/db/ExecutionEngine.h
index 1a396cd72b..f942e1faa6 100644
--- a/cpp/src/db/ExecutionEngine.h
+++ b/cpp/src/db/ExecutionEngine.h
@@ -20,7 +20,7 @@ enum class EngineType {
     FAISS_IVFFLAT,
     FAISS_IVFSQ8,
     NSG_MIX,
-    MAX_VALUE = FAISS_IVFSQ8,
+    MAX_VALUE = NSG_MIX,
 };
 
 class ExecutionEngine {
diff --git a/cpp/src/wrapper/knowhere/vec_index.cpp b/cpp/src/wrapper/knowhere/vec_index.cpp
index 70fa488dec..1473afbc23 100644
--- a/cpp/src/wrapper/knowhere/vec_index.cpp
+++ b/cpp/src/wrapper/knowhere/vec_index.cpp
@@ -203,11 +203,13 @@ void AutoGenParams(const IndexType &type, const long &size, zilliz::knowhere::Co
         case IndexType::NSG_MIX: {
             auto scale_factor = round(cfg["dim"].as<int>() / 128.0);
             scale_factor = scale_factor >= 4 ? 4 : scale_factor;
-            if (!cfg.contains("nprobe")) { cfg["nprobe"] = 16 + 10 * scale_factor; }
+            cfg["nlist"] = int(size / 1000000.0 * 8192);
+            if (!cfg.contains("nprobe")) { cfg["nprobe"] = 6 + 10 * scale_factor; }
             if (!cfg.contains("knng")) { cfg["knng"] = 100 + 100 * scale_factor; }
-            if (!cfg.contains("search_length")) { cfg["search_length"] = 30 + 10 * scale_factor; }
-            if (!cfg.contains("out_degree")) { cfg["out_degree"] = 40 + 5 * scale_factor; }
+            if (!cfg.contains("search_length")) { cfg["search_length"] = 40 + 5 * scale_factor; }
+            if (!cfg.contains("out_degree")) { cfg["out_degree"] = 50 + 5 * scale_factor; }
             if (!cfg.contains("candidate_pool_size")) { cfg["candidate_pool_size"] = 200 + 100 * scale_factor; }
+            WRAPPER_LOG_DEBUG << pretty_print(cfg);
             break;
         }
     }
diff --git a/cpp/thirdparty/knowhere b/cpp/thirdparty/knowhere
index 5032e91e3d..6a4f242ec4 160000
--- a/cpp/thirdparty/knowhere
+++ b/cpp/thirdparty/knowhere
@@ -1 +1 @@
-Subproject commit 5032e91e3d8bee1760c3f86f7eb4c857e59546ad
+Subproject commit 6a4f242ec40c539f1e6d9a7305282f7ff03c19d2
diff --git a/cpp/unittest/index_wrapper/knowhere_test.cpp b/cpp/unittest/index_wrapper/knowhere_test.cpp
index 8043c3b961..abe7c84d4e 100644
--- a/cpp/unittest/index_wrapper/knowhere_test.cpp
+++ b/cpp/unittest/index_wrapper/knowhere_test.cpp
@@ -110,9 +110,9 @@ INSTANTIATE_TEST_CASE_P(WrapperParam, KnowhereWrapperTest,
                                             Config::object{{"dim", 64}, {"k", 10}, {"nprobe", 5}}
                             ),
                             std::make_tuple(IndexType::NSG_MIX, "Default",
-                                            128, 100000, 10, 10,
-                                            Config::object{{"dim", 128}, {"nlist", 1638}, {"nprobe", 10}, {"metric_type", "L2"},
-                                                           {"knng", 50}, {"search_length", 40}, {"out_degree", 30}, {"candidate_pool_size", 200}},
+                                            128, 250000, 10, 10,
+                                            Config::object{{"dim", 128}, {"nlist", 8192}, {"nprobe", 16}, {"metric_type", "L2"},
+                                                           {"knng", 200}, {"search_length", 40}, {"out_degree", 60}, {"candidate_pool_size", 200}},
                                             Config::object{{"k", 10}, {"search_length", 20}}
                             )
                             //std::make_tuple(IndexType::SPTAG_KDT_RNT_CPU, "Default",