It is not acceptable to "up" your topic so soon. Allow for at least a couple of days for people to respond. Note that users are spread around the globe, and the means different time zones...
[quote author="Kiut" date="1324237629"]When i use it, it set one color to the text but i want to st multi color for the text like grey and black[/quote]
There is no default functionality in Qt for that. You will need to subclass and render the text yourself (perhaps via QTextDocument?)