Objective  To explore the characteristics of different compositions of urinary stones in Baoshan District of Yunnan Province, and the possible formative factors of different types of stones in this region.

  Methods  A total of 1 710 urinary stone samples and the clinical data of patients were collected. The composition of the stone samples was analyzed by using the automatic infrared spectrum analysis system, and the distribution of different stone components in patients with different genders, locations and ages was compared.

  Results  Among the 1 710 patients, pure-component stones (6 types, 1 153 cases) and mixed-component stones (20 types, 557 cases) were dominated by calcium oxalate. The proportions of pure-component stones and calcium oxalate stones of the males in Baoshan district were higher than that of the females, and the proportions of apatite carbonate and magnesium ammonium phosphate stones in female patients were higher than those in male patients (P < 0.05). There was no difference in anhydrous uric acid stonesin different genders(P>0.05). Calcium oxalate was more commonly seen in upper urinary stones, while anhydrous uric acid, magnesium ammonium phosphate, and ammonium urate stones were more commonly seen in the lower urinary tract (P < 0.05). The proportion of calcium oxalate stones in D-J tube attached stone shell was lower than that in upper urinary tract stones, but the proportion of magnesium ammonium phosphate stones was higher than that in upper urinary tract stones (P < 0.016 67). Calcium oxalate stones were more common in young adults (31 to 45 years old), the incidence of uric acid stones increased with growing of age, and was more frequently observed in patients aged 45 years old, and carbonate apatite was commonly seen in patients aged 30 years old (P < 0.005).

  Conclusion  There are significant differences in the distribution of stone components in different genders, locations, and ages in Baoshan District of Yunnan Province, and there are unique distribution characteristics.