Abstract: To control postharvest apple of core rot, it was explored inhibitory effect and mechanism of the 18 kinds of salt on core rot mainly caused by Trichothecium roseum and Alternaria alternata. The results showed that sodium metabisulfite, potassium metabisulfite, sulfate, ammonium carbonate, sodium silicate, potassium silicate, disodium EDTA and aluminum chloride had better inhibitory effect, and the minimum inhibitory concentration was less than 100mmol/L. Inhibitory effect of disodium EDTA and aluminum chloride on T. roseum and A. alternata were most obvious, and inhibition rate respectively reached 91%, 83% and 84%, 84%, but p H treated lesion diameter with no significant difference between the control group, inhibitory effect of salts on core rot was evidently main role rather than the p H of solution.