This study investigated the effect of tannic acid and cisplatin on PERK-ATF4 pathway of endoplasmic reticulum stress in hepatocellular carcinoma HepG2 cells and the molecular mechanism of tannic acid(TA) combined with cisplatin(CDDP) against hepatocellular carcinoma. HepG2 cells were cultured with 180 μM TA or/and 0. 9 μg/m L CDDP for 24 h or 48 h. The levels of PERK,p-PERK,ATF4,CHOP,Procaspase3 and Cleaved caspase3 were analyzed by real-time fluorescence quantitative PCR(q-RT-PCR) and Western Blot. Q-RT-PC...