A twin pregnancy consisting of a complete hydatidiform mole and live fetus is an unusual event, occurring with an incidence of 1:22,000 to 1:100,000 of all pregnancies. Due to advances in cytogenetics and ultrasonography, now permit the diagnosis of this pregnancy antenatally. And clinicians will be confronted with councelling between immediate intervention or expectant management, particularly in the case of a highly desired pregnancy. But there exists no predictors of which patients will developing invasive growth or malignant change. Close monitoring of the patients would be necessary during the pregnancy due to possibilities of the developing the persistent gestational trophoblastic disease. And it may be acceptible for a patient showing no symptoms and no metastasis, continuing of the pregnancy to term. We report one case of a complete mole with coexisting fetus , healthy, normal fetus and be carried to 29 weeks with a good fetal outcome.