Abstract: The systematical survey in the farm shows that botrytis cinerea Pers mainly infects the withered petals of cucumber,and the incidence accounts for 90.2%～93.0% of the total infected amount,the incidence on stigma and calyx makes up 6.9%～9.3%.The new technologies of preventing and curing botrytis cinerea Persof cucumber by plucking flowers and bagging are put forward firstly.The effects of the two measures on prevention and cure of botrytis cinerea are 80.3%～94.7% and 61.4%～95.6% respectively.The best stages of taking the measures are from blooming to 1～2d after withering and before blooming to florescence.The former stage has no evident reaction on the development of the fruits,and incidence of wilting fruits is decreased by 18.0%～20.6%.At the different developing stages of the fruits,bagging all have the effect of increasing production,and the lengths of the fruits are increased by 7.4%～10.3%,the weights increased by 6.7%～10.8%.The incidence of wilting fruits is decreased by 11.3%～30.2% by bagging before flowers wither,and abnormal fruits are decreased by 41.2%～61.6%.