index 35d481c..c48e12b 100755
--- a/src/plugins/pinyin/plugin/pinyininputmethod_.cpp
+++ b/src/plugins/pinyin/plugin/pinyininputmethod.cpp
@@ -229,12 +229,12 @@ public:
             activeCmpsLen = activeCmpsLen - (surface.length() - surfaceDecodedLen);
             composingStrDisplay = fullSent.mid(0, fixedLen);
             for (int pos = fixedLen + 1; pos < splStart.size() - 1; pos++) {
-                composingStrDisplay += surface.mid(splStart[pos], splStart[pos + 1] - splStart[pos]).toUpper();
+                composingStrDisplay += surface.mid(splStart[pos], splStart[pos + 1] - splStart[pos]);
                 if (splStart[pos + 1] < surfaceDecodedLen)
                     composingStrDisplay += QLatin1String(" ");
             }
             if (surfaceDecodedLen < surface.length())
-                composingStrDisplay += surface.mid(surfaceDecodedLen).toLower();
+                composingStrDisplay += surface.mid(surfaceDecodedLen);
         }
         q->inputContext()->setPreeditText(composingStrDisplay);