diff --git a/src/db.cc b/src/db.cc
index 1737688..1e3fe77 100644
--- a/src/db.cc
+++ b/src/db.cc
@@ -5,6 +5,7 @@
 #include "easylogging++.h"
 
 #include "wechat_function.h"
+#include "utils.h"
 using namespace std;
 
 namespace wxhelper {
@@ -117,8 +118,16 @@ int DB::Select(DWORD db_hanle, const char *sql,
     vector<string> item;
     for (size_t i = 0; i < it.size(); i++) {
       if (!it[i].is_blob) {
-        string content(it[i].content);
-        item.push_back(content);
+        bool is_utf8 = Utils::IsTextUtf8(it[i].content, it[i].content_len);
+        if (is_utf8) {
+          string content(it[i].content);
+          item.push_back(content);
+        } else {
+          string b64_str =
+              base64_encode((BYTE *)it[i].content, it[i].content_len);
+          item.push_back(b64_str);
+        }
+
       } else {
         string b64_str =
             base64_encode((BYTE *)it[i].content, it[i].content_len);
diff --git a/src/utils.cc b/src/utils.cc
index e2dc855..07fd094 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -1,7 +1,6 @@
-#include "pch.h"
-#include "utils.h"
-
+#include "utils.h"
 
+#include "pch.h"
 
 namespace wxhelper {
 std::wstring Utils::UTF8ToWstring(const std::string &str) {
@@ -19,7 +18,7 @@ std::wstring Utils::AnsiToWstring(const std::string &input, DWORD locale) {
     MultiByteToWideChar(CP_UTF8, 0, input.c_str(), -1, &temp[0], wchar_len);
     return std::wstring(&temp[0]);
   }
-  
+
   return std::wstring();
 }
 
@@ -102,8 +101,6 @@ void Utils::Hex2Bytes(const std::string &hex, BYTE *bytes) {
   }
 }
 
-
-
 bool Utils::IsDigit(std::string str) {
   if (str.length() == 0) {
     return false;
@@ -119,7 +116,8 @@ bool Utils::IsDigit(std::string str) {
 bool Utils::FindOrCreateDirectoryW(const wchar_t *path) {
   WIN32_FIND_DATAW fd;
   HANDLE hFind = ::FindFirstFileW(path, &fd);
-  if (hFind != INVALID_HANDLE_VALUE  && (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
+  if (hFind != INVALID_HANDLE_VALUE &&
+      (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)) {
     FindClose(hFind);
     return true;
   }
@@ -174,4 +172,19 @@ std::string Utils::WCharToUTF8(wchar_t *wstr) {
   return std::string();
 }
 
+bool Utils::IsTextUtf8(const char *str, int len) {
+  int needed = MultiByteToWideChar(CP_UTF8, 0, str, len, NULL, 0);
+  wchar_t *wide_str = new wchar_t[needed];
+  MultiByteToWideChar(CP_UTF8, 0, str, len, wide_str, needed);
+
+  char *new_str = new char[len + 1];
+  WideCharToMultiByte(CP_ACP, 0, wide_str, -1, new_str, len + 1, NULL, NULL);
+
+  bool isUtf8 = strcmp(str, new_str) == 0;
+
+  delete[] wide_str;
+  delete[] new_str;
+
+  return isUtf8;
+}
 }  // namespace wxhelper
\ No newline at end of file
diff --git a/src/utils.h b/src/utils.h
index b5e50b1..331b2fa 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -47,6 +47,8 @@ class Utils {
 
   static std::string WCharToUTF8(wchar_t *wstr);
 
+  static bool IsTextUtf8(const char *str, int len);
+
   template <typename T1, typename T2>
  static std::vector<T1> split(T1 str, T2 letter) {
     std::vector<T1> arr;