Abstract: Though the fungicides effect trials in field, the pharmaceutical formulations with 20ml 10% of screened azoxystrobin, 3kg water and 80kg seed potatoes was screened, with promotion the seedling early-onset, disease prevention and yield increacing, which can prevent the potato late blight disease effectively, anti-efficiency up to 86.7%, increasing rate at 64.7%, the condition index at 5.1%. The differences between process and other processes were significant and very significant at 0.05 and 0.01 level. That can be applicatied in the large area.