Invasive mole is defined as the invasion of molar villi into myometrium or the metastasis on several organs from hydatidiform mole. It is not understood accurately, because this disease is clinically occult and the diagnosis is usually made on the basis of hysterectomy. An invasive mole causing uterine rupture is a rare occurrence. We describe below a case with an unusual hemoperitoneum finding. The patient underwent total abdominal hysterectomy and pathologic examination indicated invasive mole. A brief reviews of related literatures was done.