Benign metastasizing leiomyoma (BML) is a rare entity usually occuring in females with history of uterus leiomyoma. It appears as a histopathologic benign smooth muscle tumors, distant from the uterus. It is hormone dependent and progresses slowly. Operation is the main clinical treatment. The article was reported one case who was a thirty-eight years old female. She was found to have bilateral lung nodules after hysterectomy of uterine leiomyoma seven years ago. An open lung biopsy revealed that the nodules consist of proliferating smooth muscle cells with a histopathologic feature which was similar to her uterus leiomyoma. Positive staining of estrogen and progesterone receptors were detected, which proved the tumer originate from uterine. The patient did not accept operation, chemotherapy, radiotherapy or other treatment. We still follow up the development of the case.