6 kinds of pharmacy were screened to prevent Phytophthora capsici Leonian in the early pathogenesis stages of pepper.The results showed that the prevention effect of 80% Dimethomorph WP 5000×was the best,which was the ideal pharmacy to prevent Phytophthora capsici Leonian and the prevention effect was 95.2%.The second was 10% Cyazofamid SC 2000×and 50% Fluazinam WP 1500×,and the prevention effects were 93.73% and 92.56%,respectively.It was suggested that new pharmacies of 80% Dimethomorph WP 5000,10% Cyazofamid SC 2000×and Fluazinam WP 1500×should be used to substitute some old pharmacies,like Antivirus alum,metalaxyl,etc.A variety of pharmacy can be rotationally used in order to delay the occurrence of drug resistance.