Abstract: It has been evident from the treatment of PGR to Chinese Chestnut that BA(1000 ppm) promotes fruit bearing number,seed rate and individual tree yield while inhibiting the growth of new shoots the expansion of leaves area; both penicillin and RS(300 ppm,a mixture of chemicals with rare-earth elements) can increase seed rate, but, the former also promotes the formation of female flower and prevents from the stretch of new shoots, the later, on the other hand, has a lot to do in promoting the diameter growth of new shoots; MN(500 ppm, a special combinations of PGRs) has significant effects on promoting the formation of female flower, fruit bearing number, seed rate and individual tree yield; PP333 (500 ppm) can increase seed rate in some extent but retarding the expansion of leaves area; GA3 (200 ppm) though can increase seed rate, it promotes the growth of new shoots greatly as well, thus inhibiting the formation of female flower and reducing female/male flower ratio and fruit bearing number. The results of analysis on internal hormones suggest that higher GA, concentration is more favorable to the development of male flower.