Renal injury resulting from external trauma continue to be common because of the speed and violence of modern transportation. The authors analysis 28 blunt abdominal trauma patients who suspected renal injury form January 1975 to December 1979. The results are based on clinical, physical and radiological examinations especially intravenous urography. The brief results are as follows : 1) Among all 28 patients , 23 cases were male and 5 cases with female. 10 patients were under 15 years old. 2) IVP findings are 8 cases were normal and 20 cases were abnormal. Among abnormal findings, extra renal hematoma were 11 , delayed or incomplete visulization were 4 , parenchymal hematoma was 1 , and extravasation was 1. 3) In most cases, conservative therapy was done without anysignificant complication. 4) Intravenous urography is very useful and universal method for diagnosis of renal injury. 5) Also a case reported. uriniferous pseudocyst following operation of renal injury.