Here is a great paper that shows that more than 99% of Chinese clinical trials show a positive result. Either null results are being suppressed or data is being fabricated.
It should be noted that the paper (as I've read in the abstract) extrapolates from MEDICAL data. There's a huge prevalence of pseudomedicine and mysticism which receives incorrect confirmation (as evidenced by the aforementioned paper), but a poor publication record in medicine journals isn't necessarily a good predictor of physics journals.
http://www.dcscience.net/Vickers_1998_Controlled-Clinical-Tr...
Good science certainly comes out of China, but a lot bad science comes along too.