diff --git a/include/cppjieba/Unicode.hpp b/include/cppjieba/Unicode.hpp
index 22a9d83..87de505 100644
--- a/include/cppjieba/Unicode.hpp
+++ b/include/cppjieba/Unicode.hpp
@@ -18,9 +18,14 @@ typedef uint32_t Rune;
 struct Word {
   string word;
   uint32_t offset;
+  uint32_t unicode_offset;
+  uint32_t unicode_length;
   Word(const string& w, uint32_t o)
    : word(w), offset(o) {
   }
+  Word(const string& w, uint32_t o, uint32_t unicode_offset, uint32_t unicode_length)
+          : word(w), offset(o), unicode_offset(unicode_offset), unicode_length(unicode_length) {
+  }
 }; // struct Word
 
 inline std::ostream& operator << (std::ostream& os, const Word& w) {
@@ -31,11 +36,16 @@ struct RuneStr {
   Rune rune;
   uint32_t offset;
   uint32_t len;
+  uint32_t unicode_offset;
+  uint32_t unicode_length;
   RuneStr(): rune(0), offset(0), len(0) {
   }
   RuneStr(Rune r, uint32_t o, uint32_t l)
     : rune(r), offset(o), len(l) {
   }
+  RuneStr(Rune r, uint32_t o, uint32_t l, uint32_t unicode_offset, uint32_t unicode_length)
+          : rune(r), offset(o), len(l), unicode_offset(unicode_offset), unicode_length(unicode_length) {
+  }
 }; // struct RuneStr
 
 inline std::ostream& operator << (std::ostream& os, const RuneStr& r) {
@@ -132,15 +142,16 @@ inline RuneStrLite DecodeRuneInString(const char* str, size_t len) {
 inline bool DecodeRunesInString(const char* s, size_t len, RuneStrArray& runes) {
   runes.clear();
   runes.reserve(len / 2);
-  for (size_t i = 0; i < len;) {
+  for (size_t i = 0, j = 0; i < len;) {
     RuneStrLite rp = DecodeRuneInString(s + i, len - i);
     if (rp.len == 0) {
       runes.clear();
       return false;
     }
-    RuneStr x(rp.rune, i, rp.len);
+    RuneStr x(rp.rune, i, rp.len, j, 1);
     runes.push_back(x);
     i += rp.len;
+    ++j;
   }
   return true;
 }
@@ -182,7 +193,8 @@ inline Unicode DecodeRunesInString(const string& s) {
 inline Word GetWordFromRunes(const string& s, RuneStrArray::const_iterator left, RuneStrArray::const_iterator right) {
   assert(right->offset >= left->offset);
   uint32_t len = right->offset - left->offset + right->len;
-  return Word(s.substr(left->offset, len), left->offset);
+  uint32_t unicode_length = right->unicode_offset - left->unicode_offset + right->unicode_length;
+  return Word(s.substr(left->offset, len), left->offset, left->unicode_offset, unicode_length);
 }
 
 inline string GetStringFromRunes(const string& s, RuneStrArray::const_iterator left, RuneStrArray::const_iterator right) {