Objective To analyze the effects of erector spinae plane block(ESPB)on postoperative analgesic consumption,visual analog scale(VAS)pain scores,and postoperative nausea and vomiting(PONV)in breast cancer patients,and to evaluate its advantages and disadvantages compared to general anesthesia(GA),thoracic paravertebral block(TPVB),and pectoral nerve block(PECS),providing a systematic review of its clinical application.Methods We searched English databases including PubMed,Embase,Scopus,Cochrane Library,and Web of Science,as well as Chinese databases such as CNKI,Wanfang,and Weipu,including randomized controlled trials.The Cochrane bias risk assessment tool was used for bias risk evaluation,and RevMan 3.5 software was utilized for meta-analysis.Results A total of 31 randomized controlled trials involving 2296 patients were included.The meta-analysis results indicated that the morphine consumption in the ESPB group was lower than that in the GA group at 24 hours postoperative(MD-17.57,95％CI-23.99 to-11.14,P＜0.05).VAS scores at 2,6,12,and 24 hours postoperative were also lower in the ESPB group compared to the GA group(P＜0.05),and the incidence of PONV in patients was reduced(RR 0.57,95％CI 0.47 to 0.69,P＜0.05),with all differences being statistically significant.No statistically significant differences were found in morphine consumption at 24 hours postoperative between the ESPB and TPVB groups,nor in VAS scores at 2,12,and 24 hours postoperative,and the number of PONV cases showed no statistically significant difference.The morphine consumption in the PECS group at 24 hours postoperative was lower than that in the ESPB group(MD 10.94,95％CI 4.40 to 17.48,P＜0.05),and the VAS score at 12 hours postoperative in the PECS group was lower than that in the ESPB group(MD 0.59,95％CI 0.19 to 0.99,P＜0.05),indicating statistical significance,while no significant differences were observed at other time points.Conclusions The analgesic effect of the ESPB group is superior to that of the GA group and similar to that of the TPVB group,but inferior to that of the PECS group.Compared to the GA group,ESPB significantly reduces the incidence of postoperative PONV,showing similarity with the TPVB and PECS groups.