While it's an interesting idea, as a graphic designer I can't help but interject a bit of constructive criticism
an important element of flags is a relation of all the parts to a whole. Notice on the taiwanese flag that the blue field in the upper left quadrant is precisely one quarter of the whole. Furthermore, the elements that comprise the sun are proportional to the area surrounding the graphic.
nurizeko, on your flag, the area that contains the map of china is quite a bit larger than a fraction of the whole flag, which makes the blue field feel weighted unevenly.
The white star is also disproportionately large, which gives it more visual importance than the map of China, which is much more intricate and detailed (elements that would be lost in smaller reproductions).
Lastly, having the field behind the map of China as white makes it interact with the white star, and has no relationship to the map itself, other than to act as a container for it. The yellow star is promptly lost, and seems to have no significance or relationship to the larger white star.
Not that it's a bad idea, but the elements all need to have some sort of relation to each other, and to the frame of reference of the flag itself.