Engineer
Major
As MiG says there are all sorts of materials. As far as you and I know China has not built a COMPLETELY composite aircraft where American aerospace has. Composite panels are one thing. A complete composite aircraft is another. Even Airbus is having trouble building their first complete composite aircraft
EADS delays Airbus A350 launch
Early problems with production of the A350 wings, constructed at a factory in Broughton, Wales, are behind the latest delay to the aircraft’s entry into service.
This post you made is entirely meaningless, as it is irrelevant to the subject being discussed. No one claimed China is building an A350 equivalent.
The fact remains that Chiina can manufacture its own composite panels for production aircraft, as indicated by the picture of J-10B prototype. This shows your implication that China is unable to produce such material as incorrect. Below is another picture showing China's use of composite for another production aircraft: