Objective To determine the clinical lecture and treatment principle of pregnancy with ovarian tumor. Methods Retrospectively analysing the clinical result of 76 pregnancies with ovarian tumor. All patients were managed surgically and had pathologic diagnosis . Results The incidence of ovarian tumor in pregnant women who required surgical managnment was 1 in 164 live births. The incidence of mature teratoma , endometrial cyst, serous cystadenoma and mucinous cystadenoma of ovarian in pregnancy is 48.10% ,15....