In 2013, the situation of the walnut infected by anthracnose and black spot in Shimian county were surveyed, and 4 kinds of fungicides (70% thiophanate-methyl, 25% prochloraz, 20% zinc thiazole, 100% streptomycin) were screened out, which were combined into 16 groups to prevent walnut anthracnose and black spot in the fields. The result showed: in mid-July, a large outbreak of walnut anthracnose and black spot was occurred and the developing speed of the disease on the fruits was faster than that on the leaves. On August 26th, the disease index of anthracnose and black spot were 54.22 and 41.15 respectively on the fruit, and 35.08 and 32.54 respectively on the leaves. 25% prochloraz diluted 1 000 times＋70% thiophanate-methyl diluted 1000 times had the best control efficiency to black spot on the leaves. 25% prochloraz diluted 500 times＋70% thiophanate-methyl diluted 1 000 times had the best control efficiency to anthracnose and black spot on the fruits. 20% zinc thiazole diluted 400 times＋70% thiophanate-methyl diluted 1 000 times had the best control efficiency to anthracnose on the leaves. 100% streptomycin diluted 3 000 times＋70% thiophanate-methyl diluted 1 000 times, 25% prochloraz diluted 1 000 times＋70% thiophanate-methyl diluted 1 000 times and 20% zinc thiazole diluted 1 000 times＋70% thiophanate-methyl diluted 1 000 times could improve the rate of fruit retention and the rate of increase output well.