Precocious puberty may be classified as true precocious puberty or precocious pseudopuberty. The latter one in females may be in sexual (feminization) or hereto sexual (virilization). Ovarian tumors may be iso sexual call tumor, teratoma, etc, are among the etiologic factors of precocious psudopuberty. This paper presents a 4-year girl was admitted to the hospital with severe abdominal pain. Physical examination revealed generalized pertonitis and signs of precocious pseudo puberty including bilateral breast development, appearance of hair in face, trunk, external genitalia and lower extremity. Laparatomy confirmed the diagnosis of a right ovation tumor measuring 15x20cm and pathologist report stated granulosa cell tumor with intraparenchymal necrosis and hemorrhage. The age and clinical presentation of this patient, with regard to rare occurrence of G.C.T in pre-pubertal years (5%) make her as an unusual case.