Objective To study the incidence and risk factors of post-operative pain after receive offpump coronary artery bypass grafting(OPCAB) and totally endoscopic coronary artery bypass graft on beating heart(BH-TECAB).Methods Totals of 80 patients received coronary artery bypass grafting were divided into two groups according to the different of operation procedure,BH-TECAB group(40 cases)and OPCAB group(40 cases).Basic situation,anesthesia conditions,surgical conditions,postoperative situation,and the incidence and degree of postoperative pain in two groups were collected.Results There was no significant difference between two groups in the basic situation.All patients had no postoperative complications and recovered smoothly.The incidence of 1-degree,2-degree and 3-degree postoperative pain in the BH-TECAB group [ 32.5％ ( 13/40),7.5％ (3/40) and 2.5％ ( 1/40 ) ] was significantly lower than that in the OPCAB group [45.0％ ( 18/40),15.0％ (6/40) and 10.0％ (4/40) ],the difference was significant (P ＜0.05).The time of breathing machine using,blood transfusion in 24 hours,the amount of flow in BH-TECAB group,respectively,was ( 14.35 ± 1.66 ) h,( 54.79 ± 15.69 ) ml,( 227.12 ± 120.38 ) ml,that significantly lower than that in OPCAB group which was ( 18.64 ± 1.57) h,( 120.75 ± 20.98 ) ml and ( 389.17 ± 138.66 ) ml,the difference was significant ( P ＜ 0.05 ).Conclusions The different of the operation procedure influences the incidence of postoperative pain of patients receive coronary artery bypass grafting.BH-TECAB has the features of mini-wound,less pain and fast healing.