Objective To approach the chemical composition of urinary calculus for its clinical prevention and treatment. Methods The 326 samples of the inpatients with stone were included in this study in Qiyang People′s Hospital from June 2013 to May 2014. The infrared spectrum analysis system were adopted to analyze stone samples. Results The mixed urinary stones prevailed in the urinary calculus,accounting for 87.73%(286/326),in which,the most component was the calcium oxalate and calcium oxalate monohydrate,accounting for 96.32%(314/326),followed by ...