Taking ‘Hongdiqiu’ grape peel as experimental materials,the occurrence-time,causes of an illness and harmful situation were investigated.Controlling effciency of some fungici-des against downy mildew of grape were compared between before and after.The results showed that during before blooming and young fruit stage,using resin acid copper and amistar could effectively prevent effective measures against AIDS spreading.Their normal inflorescence development wiould be guaranteed;Using ko-cide 2000 DF and equation proafteronset.Effective control effective measures against AIDS spreading.