Mancozeb + Metalaxyl is a new type fungicide. It has double effect ofsystematic, conduction and treatment. It can sever as a fatal enemy of major obstinate disease in growing period of the crop. If add active molecule penetrant with high performance, it can enter the in vivo of the plant rapidly, and expand omnibearingly to the ailing plant, sterilizing inside and outside. The effect is obiviously.