OBJECTIVE： To investigate the effects of Glycyrrhiza uralensis extract （GE） on the expression of uridine diphosphate glucuronyltransferase 1A （UGT1A） and multidrug resistance associated protein 2 （MRP2） in human liver L-02 cells damaged by triptolide （TP）， and to study attenuated mechanism of G. uralensison for TP. METHODS： The survival rates of L-02 cells were determined by MTT assay after cultured with 0 （blank control）， 40， 80， 160 nmol/L TP for 12， 18， 24 h. L-02 cells were divided into blank control group （blank culture medium）， model control group （80 nmol/L TP） and GE pretreatment group （adding 80 nmol/L TP after pretreated with 30， 60， 90 mg/L GE for 24 h）； after cultured for 18 h， survival rates of L-02 cells were determined by MTT assay. Rifampin （RIF） group （positive control， adding 80 nmol/L TP after pretreated with 10 μmol/L RIF for 24 h） was added on the basis of the above grouping （GE concentration of 60 mg/L in GE pretreatment group）.After cultured for 24 h， the protein expressions of UGT1A and MRP2 were detected. RESULTS：The inhibition effect of TP on cell proliferation was positively correlated with the concentration and the time. Compared with blank control group， cell survival rate of model control group was decreased significantly （P＜0.05）， and the protein expression of MRP2 was decreased significantly （P＜0.01）. Compared with model control group，cell survival rates of 30， 60， 90 mg/L GE pretreatment groups were all increased significantly （P＜0.01）. The protein expressions of UGT1A and MRP2 were increased significantly in 60 mg/L GE pretreatment group （P＜0.01）. CONCLUSIONS： GE pretreatment can relieve TP-induced human liver L-02 cell damage， and its attenuated mechanism may be associated with the increase the expression of UGT1A and MRP2.