Objective Study the three methods' diacrisis value:X ray sheet of kidney angina cause of urinary calculus,vein renal pelvis contrast and spiral CT. Method Look back on and study 50 clinical kidney angina patients who have taken X ray sheet,or vein renal pelvis contrast, or spiral CT treatment. Compare those three methods and find the calculus positive rate and the areas of calculus frequently happening. Result X ray sheet finds that the calculus positive rate is 58%. Vein renal pelvis contrast finds that the calculus positive rate is 74%. Spiral CT finds that the calculus positive rate is 96% .All the calculus leans to appearing at the hypo - segment of ureter. And the Same - side kidney gets dropsy of different degree.Conclusion Urinary calculus, especially ureter hypo - segment calculus is the main cause of kidney angina. And spiral CT scanning is the best way to find calculus.