Pingyao County crop growth due to the impact of various factors of natural climate, soil temperature, soil-borne pathogens, field microclimate, and ventilation shaded, resistant varieties, various diseases have occurred. Some diseases become an important factor in crop production constraints, such as tomato virus disease, blight, vertically wilt of eggplant, cucumber downy mildew, powdery mildew, rot, etc. Hu Qin, therefore, how the scientific, rational use of fungicides, further improve the effectiveness of fungicides become farmers are most concerned issue. Pingyao County, combined with the actual situation now offer some suggestions for reference.