diff --git a/main.cpp b/main.cpp
index ab6545f..7b1145b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3,6 +3,7 @@
 #include <vector>
 #include <string>
 #include <algorithm>
+#include <set>
 
 #define   K_VISION_DIR   "/hard/k_vision"
 #define   AI_VISION_DIR  "/hard/ai_vision"
@@ -168,7 +169,7 @@ int main(int argc, char* argv[]) {
         std::cout << "error: K_VISION_DIR is empty" << std::endl;
         return -1;
     }
-    std::vector<std::string> vec_matched_path;
+    std::set<std::string> set_matched_path;
     std::cout << "info: >>> match file begin <<<" << std::endl;
     int j = 0;
     for (auto it:vec_file_name)
@@ -188,16 +189,16 @@ int main(int argc, char* argv[]) {
                 auto timestamp = get_file_timestamp(path);
                 if (timestamp >= vec_datetime.front() && timestamp <= vec_datetime.back())
                 {
-                    vec_matched_path.push_back(path);
+                    set_matched_path.insert(path);
                 }
             }
         }
         std::cout << "info: match progress " << j << "/" << vec_file_name.size() << std::endl;
     }
-    std::cout << "info: >>> match file end(" << vec_matched_path.size() << ") <<<" << std::endl;
+    std::cout << "info: >>> match file end(" << set_matched_path.size() << ") <<<" << std::endl;
     std::cout << "info: >>> copy file begin <<<" << std::endl;
     int i = 0;
-    for (auto it:vec_matched_path)
+    for (auto it:set_matched_path)
     {
         fs::path path(it);
         auto strName = path.filename().string();
@@ -214,7 +215,7 @@ int main(int argc, char* argv[]) {
         }
         if (i % 50 == 0)
         {
-            std::cout << "info: copy progress " << i << "/" << vec_matched_path.size() << std::endl;
+            std::cout << "info: copy progress " << i << "/" << set_matched_path.size() << std::endl;
         }
     }
     std::cout << "info: >>> copy file end(" << i << ") <<<" << std::endl;