
And finally, I found the answer. Here are the steps
1. Create a box with the Bezier Tool perspective

2. Make your text

3. Selection of both attractions and choose Path - Object to Path

4. Selection attractions just text and select Object - Ungroup then select Path - Union
5. Text selection while holding Shift click the object and select the Extensions box perspective - Modify Path - Perspective
I also include the video http://www.youtube.com/watch?v=cIDJNU0vQmI
And also I have posted on my blog Perspective text effect in Inkscape
Perhaps such measures different from other versions. If there is a mistake I apologize. Your comments and criticism is needed.
I'm sorry if my english is not smooth...