Objective:To study the effect of disodium cantharidinate on the proliferation,apoptosis and telomerase of SMMC-7721. Methods:MTT,Flowcytometry and ELISA were used. Results:Disodium cantharidinate can inhibit the proliferation of SMMC-7721,promote its apoptosis percentage and reduce its telomerase concentration. Conclusion:Reducing the telomerase concentration,inhibiting proliferation and inducing apoptosis may be the mechanisms of disodium cantharidinate on treatment of tumor.