Pear scab(Venturia pirina)is one of the most serious diseases on Dangshansu Pear. every year, pear peasants suffer much loss from this disease. There are many reports on expert systems for the diagnosis and prevention of fruit diseases. But an expert system for the integreted management on dangshansu pear scab has not been reported. Based on the information of pear scab and the practice experiece of the experts on plants diseases, combining with the current development of Dangshansu Pear in the area of Yellow River, this paper describes an expert system for the integreted management on Dangshansu Pear scab based on CBR and RBR with Visual Basic6.0 and Photoshop softwares. The system is composed of 2 sub systems “the forecasting and preventing system of Dangshansu Pear scab” and “a design support system for integrated prevention and cure on Dangshansu Pear scab”. The system is comprehensive and its interface is simple and easy to use. It can help many agricultual experts and peasants in the area of Yellow River .