Most ovarian masses in pregnancy are asymptomatic functional cysts, such as corpus luteum cysts and follicular cysts, which mostly resolve spontaneously in mid-pregnancy. Among the benign tumors of pregnancy, mature teratoma is the most common, accounting for about 50%, followed by plasmacytoma and mucinous cystadenoma. The treatment of ovarian tumors combined with pregnancy should be individualized in order to treat the tumor without affecting the pregnancy. If ovarian tumors found before pregnancy can be excluded from non-redundant ovarian tumors, it is advisable to consider pregnancy after surgical treatment, so as to avoid ovarian tumor torsion, rupture, miscarriage and preterm delivery during pregnancy and to improve obstetric quality. 1. Early pregnancy combined with ovarian tumor If there is no complication in early pregnancy, it is appropriate to expect to operate after the third trimester. After ruling out physiological cysts it is generally considered that the best time for surgery is at 14~18 weeks, when the sensitivity of the uterus is reduced, the placenta is formed and the incidence of miscarriage is greatly reduced; in addition the uterus is not large and basically does not affect the surgical operation. The operation should be performed gently, avoiding stimulation of the uterus as much as possible, and using contraction inhibitors to calm the fetus before and after the operation. After 18 weeks of pregnancy, the tumor enters the abdominal cavity with the enlarged uterus, and the chance of tumor torsion increases; after 28 weeks, the operation is more difficult, and the tumor may prevent the fetal head from descending or even rupture after delivery. Therefore, benign ovarian tumors with indications for surgery before 18 weeks should be operated at 14 to 18 weeks. For benign ovarian tumors found after 18 weeks, if the tumor is not large and there is no obvious change in the follow-up examination, it can be expected to be removed together with the cesarean section after full term or it is appropriate to remove the tumor after delivery; if the tumor becomes larger and larger in the follow-up examination, and there are realistic components in the capsule, it is suspected to be malignant tumor, then surgery should be performed as soon as possible. In recent years, laparoscopic surgery has become the standard procedure for benign ovarian tumors, with the advantages of minimally invasive, short operation time, fast postoperative recovery, short hospital stay, and low incidence of postoperative complications such as poor incision healing and pelvic and abdominal adhesions. There is a gradual increase in the literature on laparoscopic surgery for the treatment of benign tumors combined with pregnancy. The physiological characteristics of pregnant patients make laparoscopy more risky, the enlarged uterus affects the surgical field and operation, and CO2 pneumoperitoneum can cause hypercapnia with uterine hypoperfusion. A comprehensive preoperative assessment of the patient is required to decide whether to perform laparoscopy, and the procedure must be performed by an experienced anesthesiologist in collaboration with the surgeon. Due to the low incidence of ovarian tumors in pregnancy, there is currently no evidence based on evidence whether laparoscopic surgery increases the rate of fetal loss. The therapeutic benefits of laparoscopic surgery in pregnancy have not been fully established and need to be confirmed in future clinical studies. Open surgery should be performed with a longitudinal incision in the lower abdomen to fully expose the adnexal region, while intraoperative pathology is useful to expand the scope of surgery if it is confirmed to be malignant. Whether open or laparoscopic surgery is performed, intraoperative stimulation of the uterus should be avoided as much as possible to prevent miscarriage and preterm delivery.