diff --git a/src/char_converter.c b/src/char_converter.c
index 879d0e2..41bab29 100644
--- a/src/char_converter.c
+++ b/src/char_converter.c
@@ -60,6 +60,12 @@ int std_space_char_converter_init(FastCharConverter *pCharConverter,
     return char_converter_init(pCharConverter, pairs, SPACE_CHAR_PAIR_COUNT);
 }
 
+void char_converter_set_pair(FastCharConverter *pCharConverter,
+        const unsigned char src, const unsigned char dest)
+{
+    pCharConverter->char_table[src] = dest;
+}
+
 int fast_char_convert(FastCharConverter *pCharConverter,
         char *text, const int text_len)
 {
diff --git a/src/char_converter.h b/src/char_converter.h
index 770955c..206e82c 100644
--- a/src/char_converter.h
+++ b/src/char_converter.h
@@ -60,6 +60,17 @@ int char_converter_init(FastCharConverter *pCharConverter,
 int std_space_char_converter_init(FastCharConverter *pCharConverter,
         const unsigned char dest_base);
 
+/**
+ *  standard space chars to convert
+ *  parameters:
+ *           pCharConverter: the char converter
+ *           src: the src char
+ *           dest: the dest char
+ *  return: none
+*/
+void char_converter_set_pair(FastCharConverter *pCharConverter,
+        const unsigned char src, const unsigned char dest);
+
 /**
  *  char convert function
  *  parameters: