The best time for chocolate cyst surgery is within 3-7 days of menstrual cleansing, during which the results are relatively good. Chocolate cysts are caused by ectopic endometriosis of the uterine lining to the ovaries, forming endometriotic cysts of the ovaries, also known as chocolate cysts. The endometrium that is ectopic to the ovary will also proliferate and shed in response to changes in the menstrual cycle, resulting in bleeding, but since there is no outlet, it will accumulate more and more, forming a chocolate cyst. Within 3-7 days after the menstrual period is cleared, if the operation is done during this period, it is beneficial to remove the endometrial lesions and separate the adhesions, and can restore the normal anatomy of the ovary. Therefore, if there are no special circumstances, it is recommended to operate within the 3rd-7th day after menstruation.