In 2007,an field experiment to test four fungicides for control of late blight in potato is carried out in the main potato producing area in Mian-ning country,Liangshan.The four fungicides are 687.5g/LYnfinitoSE,70% AntracolWP,58%Metalaxyl&MancoZebWP and MetalaxylWP.The results show that the four fungicides have obvious effect on disease resistance of late blight of potato.But, 687.5g/LynfinitoSE has the best effect on produce-increasing and disease-controlling.