Objective To analyze the outcome and cost-effectiveness of invitrofertilization-embryotransfer（IVF-ET）assisted pregnancy in endometriosis（EMs）patients with different stages．Methods The outcomes and costs of patients with stageⅠ-Ⅱ and Ⅲ-Ⅳ EMs treated with follicular phase long protocol and patients treated with luteal phase long protocol due to“tubal factors” during the same time from January 2016 to January 2022 were retrospectively analyzed．Results The levels of LH,E2 on initiation day and the levels of E2 on hCG day in EMs groups were lower than those in control group（P<0.05）,the number of available embryos,implantation rate,clinical pregnancy rate and live birth rate in stage Ⅲ-Ⅳ EMs group were significantly lower than those in control group and stageⅠ-Ⅱ EMs group（P<0.05）,and the abortion rate was higher．But there was no significant difference between groups（P>0.05）．There were no significant differences in the dosage of Gn,duration of Gn,the levels of LH on hCG day,the number of follicles with diamete≥14 mm on hCG day,endometrial thickness on hCG day,number of oocytes retrieved,fertilization rate and cleavage rate among the three groups（P>0.05）．Conclusions For different stages of endometriosis,patients in stageⅠ-Ⅱ who apply the follicular phase long protocol can achieve good pregnancy outcomes,and their pregnancy rate and cost are comparable to the traditional regimen,while patients in stage Ⅲ-Ⅳ have a low pregnancy rate,and the cost of pregnancy is higher,which should be related to the severity of the disease and the choice of regimen.