The result of studies of is chemical male gametocides on rapeseed (B.napus) were indicated that the percentage of male-sterility plant caused by 0.4% GA,, 1% or 1.5%MG5, 1.5%KMS-1 and 0.5%MG5 at l nucleate pollen stage tratment were more than 80%. The microsporogenesis is abnormal,the peroxidase isoenzyme bands is less and weaker,the dehydrogenase activity is weaker on male sterile anthers of rapeseed induced by chemical male game-tocide.The hybrids produced by chemical male gametocide showed great hetero-sis on seed yield. The seed yield of lo...