Objective To investigate the effect and mechanism of Huangqi Jianzhong decoction(HQJZT) in the treatment of duodenal ulcer(DU)with spleen and stomach deficiency cold type syndrome in rats based on Raf/MEK/ ERK signaling pathway. Methods Sixty SD rats were randomly divided into normal group, model group, esomeprazole group(4.17 mg·kg~(-1)), HQJZT low dose and high dose groups(18.54, 9.27 g·kg~(-1)). DU model of spleen-stomach deficiency cold pattern was established by “bitter cold herbs + defatigation” method combined with aspirin and anhydr...