diff --git a/Src/DLT_Utilities.cpp b/Src/DLT_Utilities.cpp
index 5aa756b..5e04b9a 100644
--- a/Src/DLT_Utilities.cpp
+++ b/Src/DLT_Utilities.cpp
@@ -183,10 +183,6 @@ DLT_Type::DLT_Err DLT_Log::dlt_file_read_header(FILE *p_file, DLT_Type::DLT_Msg
     // 计算Payload长度
     Msg->payload_length = Msg->standard_header.len - msg_header_len;
 
-    // 统计最长长度
-    if (Msg->payload_length > this->max_payload_len)
-        this->max_payload_len = Msg->payload_length;
-
     return DLT_Type::DLT_ERROR_NONE;
 }
 
@@ -267,6 +263,10 @@ DLT_Type::DLT_Err DLT_Log::load_from_file(const char *file_name_str)
                 this->Msg_List_End = p_target_msg;
             }
 
+            // 统计最长长度
+            if (Msg.payload_length > this->max_payload_len)
+                this->max_payload_len = Msg.payload_length;
+
             this->loaded_msg_count++;
         }
     }