Abstract: By determining EC50 values, the sensitivities of two tomato pathogenic fungi (Alternaria solani and Phytophthora infestans) to several fungicides were tested. The results showed that Alternaria solani were sensitive to 25% SYP-2048 EC and 25% prochloraz EC and intermediate resistant to 50% procymidone WP、0.3% eugenol SL and 10% polyoxin B WP；Phytophthora infestans were sensitive to 25% SYP-2048 EC only and intermediate resistant to 25% prochloraz EC、0.3% eugenol SL、10% polyoxin B WP and highly resistant to 50% procymidone WP; two pathogen fungi were both relatively sensitive to 2×108cfu/g Trichoderma viride WP and 8×109cfu/ml Bacillus subtilis AS, the EC50 values were less than 1×108cfu/L.