ObjectiveTo evaluate percutaneous cyst in jection of aluminous mixture for renal cystic diseases.MethodsRetrospective analysis was made on 1295 cases of renal cystic diseases t reated by percutaneous cyst injection of aluminous mixture under guidance of ult rasound B.All together 1529 cysts including 1142 monocystic cysts and 153 polycy stic cysts were treated.ResultsAll the patients were f ollowed up for six months.The curative rate was 85.4%(1306/1529) and the markedl y improving rate 13.0 %(199/1529),the total effective rate was 98.4%.The lon g-term follow-up showed that reoccurence rates were 0.75%(6/798),0.92%(5/546), 1.72%(3/174) and 1.14%(1/71) in 1,3,5 and ten or more years respectively.3.1%(40 /1295) of the patients complained of lumber discomfort.No one had infection,feve r,sharp lumber pain or headache.ConclusionsCystic inje ction of aluminous mixture under the guidance of ultrasound B is a safe,feasible and effective method for the treatment of renal cystic diseases.