diff --git a/components/bt/host/bluedroid/bta/hf_client/bta_hf_client_api.c b/components/bt/host/bluedroid/bta/hf_client/bta_hf_client_api.c
index 4cb1c9b953..5f0fcf660c 100644
--- a/components/bt/host/bluedroid/bta/hf_client/bta_hf_client_api.c
+++ b/components/bt/host/bluedroid/bta/hf_client/bta_hf_client_api.c
@@ -284,8 +284,13 @@ void BTA_HfClientSendAT(UINT16 handle, tBTA_HF_CLIENT_AT_CMD_TYPE at, UINT32 val
         p_buf->uint32_val2 = val2;
 
         if (str) {
-            strlcpy(p_buf->str, str, BTA_HF_CLIENT_NUMBER_LEN + 1);
-            p_buf->str[BTA_HF_CLIENT_NUMBER_LEN] = '\0';
+            UINT32 str_len = strlen(str);
+            if (str_len > BTA_HF_CLIENT_MAX_LEN) {
+                APPL_TRACE_WARNING("%s, str length(%d) is more than %d, truncate it.", __FUNCTION__, str_len, BTA_HF_CLIENT_MAX_LEN);
+                str_len = BTA_HF_CLIENT_MAX_LEN;
+            }
+
+            strlcpy(p_buf->str, str, str_len + 1);
         } else {
             p_buf->str[0] = '\0';
         }
diff --git a/components/bt/host/bluedroid/bta/hf_client/include/bta_hf_client_int.h b/components/bt/host/bluedroid/bta/hf_client/include/bta_hf_client_int.h
index ddfc62442d..0405ab50ce 100644
--- a/components/bt/host/bluedroid/bta/hf_client/include/bta_hf_client_int.h
+++ b/components/bt/host/bluedroid/bta/hf_client/include/bta_hf_client_int.h
@@ -117,7 +117,7 @@ typedef struct {
     UINT8           uint8_val;
     UINT32          uint32_val1;
     UINT32          uint32_val2;
-    char            str[BTA_HF_CLIENT_NUMBER_LEN + 1];
+    char            str[BTA_HF_CLIENT_MAX_LEN + 1];
 } tBTA_HF_CLIENT_DATA_VAL;
 
 /* union of all event datatypes */
diff --git a/components/bt/host/bluedroid/bta/include/bta/bta_hf_client_api.h b/components/bt/host/bluedroid/bta/include/bta/bta_hf_client_api.h
index e01b7a1c75..3deb9d262d 100644
--- a/components/bt/host/bluedroid/bta/include/bta/bta_hf_client_api.h
+++ b/components/bt/host/bluedroid/bta/include/bta/bta_hf_client_api.h
@@ -156,6 +156,8 @@ typedef UINT8 tBTA_HF_CLIENT_IND_TYPE;
 
 typedef UINT8 tBTA_HF_CLIENT_AT_CMD_TYPE;
 
+#define BTA_HF_CLIENT_MAX_LEN 32
+
 /* data associated with most non-AT events */
 /* placeholder, if not needed should be removed*/
 typedef struct {