Abstract:【Objective】 To explore the curative effect of improved laparoscopic assisted vaginal hysterectomy in treating deep infiltrating endometriosis of posterior pelvic cavity. 【Methods】 46 routine laparoscopic assisted vaginal hysterectomies and 52 improved laparoscopic assisted vaginal hysterectomies were accomplished by the same operation doctor. The operation time, blood volume, operation complication, time of anus passage gas, post- operation disease incidence and post- operation hospital days of two operations were compared. 【Results】 There were statistics discrepancy (P <0.05) about operation time of two groups (routine laparoscopic assisted vaginal hysterectomy: (122.4±28.6) min, improved laparoscopic assisted vaginal hysterectomy (102.2±38.4)min, There were no statistics discrepancy (P >0.05) about blood volume of two groups routine laparoscopic assisted vaginal hysterectomy (234.4±102.6)mL; Improved laparoscopic assisted vaginal hysterectomy (222.4±111.8)mL. 3 routine laparoscopic assisted vaginal hysterectomies were changed to opening abdomen operation; but there was no one operation changed to opening abdomen operation. There were no operation complications in two groups. 【Conclusion】 Improved laparoscopic assisted vaginal hysterectomy can boost operation safe and achievement ratio of hysterectomy about severe endometriosis, expand laparoscopic operation indication.