Objective To study the methods for diagnosis and treatment of renal hamartoma spontaneously ruptured.Methods Clinical data of 14 cases of renal hamartoma spontaneously ruptured were reviewed retrospectively from 1998 to 2004.All the patients were examined by ultrasonography.14 cases were examined by CT scanning,4 by MRI.Results Spontaneous rupture of renal hamartoma were confirmed in 10 of diagnosis by CT scanning,14 patients all underwent pathological examinations which confirmed the diagnosis of hamartoma.The concordance of B ultrasound,CT and MRI were 28.6%,71.4% and 100% respectively with the pathological finds. Surgical operations included 8 cases of nephromy,4 cases of partial nephrectomy and 2 cases of enucleation.Conclusion It is windly acceptble that CT and MRI is the best method of imaging examination which may confirm the character of the lesion and the range of bleeding.If the tumor exceeds 5 cm and grows nearby the capsule of kidney,active treatment should be considered.Any operative management should preserve the funcion nephrons as much as possible.