diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb47555edf7ef651a4660eec5a8cf15a6316f139..3a5f5d5c26c2d70a8db4662298ed678215722d17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ Please mark all change in change log and use the issue from GitHub
 -   \#2373 Build index for small segment waste time on waiting background index thread finish
 -   \#2394 Drop collection timeout if too many partitions created on collection
 -   \#2549 Launch server fail using demo config
+-   \#2564 cache.cache_size range check error
 
 ## Feature
 -   \#2363 Update branch version
diff --git a/core/src/config/Config.cpp b/core/src/config/Config.cpp
index 87a1762d49ec89e9ae842f39f6e47a918e1e12be..b93e4a8181fff8c0073e342029eda9ca6005fcee 100644
--- a/core/src/config/Config.cpp
+++ b/core/src/config/Config.cpp
@@ -1189,7 +1189,7 @@ Config::CheckCacheConfigCpuCacheCapacity(const std::string& value) {
 
         std::string str = GetConfigStr(CONFIG_CACHE, CONFIG_CACHE_INSERT_BUFFER_SIZE, "0");
 
-        int64_t insert_buffer_size = parse_bytes(value, err);
+        int64_t insert_buffer_size = parse_bytes(str, err);
         fiu_do_on("Config.CheckCacheConfigCpuCacheCapacity.large_insert_buffer", insert_buffer_size = total_mem + 1);
         if (insert_buffer_size + cache_size >= total_mem) {
             std::string msg = "Invalid cpu cache size: " + value +
diff --git a/core/unittest/server/test_config.cpp b/core/unittest/server/test_config.cpp
index 3e3c5e17fd3eff09764fdf3c18dd49bed4d5f4e9..da41b875ccddea8085a238809a4cce6f44b85b1f 100644
--- a/core/unittest/server/test_config.cpp
+++ b/core/unittest/server/test_config.cpp
@@ -256,6 +256,30 @@ TEST_F(ConfigTest, SERVER_CONFIG_VALID_TEST) {
     ASSERT_TRUE(config.GetCacheConfigCacheInsertData(bool_val).ok());
     ASSERT_TRUE(bool_val == cache_insert_data);
 
+    {
+        // #2564
+        int64_t total_mem = 0, free_mem = 0;
+        milvus::server::CommonUtil::GetSystemMemInfo(total_mem, free_mem);
+        ASSERT_TRUE(config.SetCacheConfigInsertBufferSize("1GB").ok());
+        int64_t cache_cpu_cache_size = total_mem / 2;
+        float cache_cpu_cache_threshold = 0.7;
+        ASSERT_TRUE(config.SetCacheConfigCpuCacheThreshold(std::to_string(cache_cpu_cache_threshold)).ok());
+        ASSERT_TRUE(config.SetCacheConfigCpuCacheCapacity(std::to_string(cache_cpu_cache_size)).ok());
+        ASSERT_TRUE(config.GetCacheConfigCpuCacheCapacity(int64_val).ok());
+        ASSERT_TRUE(int64_val == cache_cpu_cache_size);
+    }
+
+    {
+        int64_t total_mem = 0, free_mem = 0;
+        milvus::server::CommonUtil::GetSystemMemInfo(total_mem, free_mem);
+        ASSERT_TRUE(config.SetCacheConfigInsertBufferSize("1GB").ok());
+        int64_t cache_cpu_cache_size = total_mem - 1073741824 - 1; // total_size - 1GB - 1
+        ASSERT_TRUE(config.SetCacheConfigCpuCacheCapacity(std::to_string(cache_cpu_cache_size)).ok());
+        ASSERT_TRUE(config.GetCacheConfigCpuCacheCapacity(int64_val).ok());
+        ASSERT_TRUE(int64_val == cache_cpu_cache_size);
+    }
+
+
     /* engine config */
     int64_t engine_use_blas_threshold = 50;
     ASSERT_TRUE(config.SetEngineConfigUseBlasThreshold(std::to_string(engine_use_blas_threshold)).ok());