For reduces the loss created by the castor-oil plant wilt disease as far as possible,symp-tom of castor-oil plant wilt disease was observed and the pathogen epiphyte was separated.Difference of resistance among varieties was studied.Crop rotation and chemical control measures were discussed.The relationship between occurrence of the castor-oil plant wilt disease and variety as well as crop rotation was made clear.The preventive and cure effect of some pesticides was presented.This provided reference to related scientific research and commercial production.