Abstract: Shanghai Wheat Scab Prediction Expert System(SWSPES)is built bas- ed on the expertise of agromoteorogists,Mathmatical models and actual mea- sured data in Shanghai area(1957—1985).The program is written in arti- ficial intelligence language GCLISP and algorithmic language BASICA.The strategy of inference is the foreword exact and inexact reasoning.The knowledge base is composed of production rules.Caculated modules contain Fuzzy preference ratio module and grey calamity forecasting module.SWSP- ES can provice service to predict the prevalent degree of wheat scab for long,medium and Short-range in Shanghai area.The forecast is classified into five classes.SWSPES can also be applied in other areas only with mo- difying and adding some rules in knowledge base.

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