When a urinary stone is acutely obstructed, most patients have experienced the pain and helplessness of not being able to stop, and many of them would like to get rid of the root of the disease at once and never have it again, and at this time, the analysis of the composition of the stone is very necessary for the doctor to develop appropriate prevention and treatment measures. Among the stone specimens we have collected, there are six types of stones: calcium oxalate, calcium phosphate, uric acid (urate), magnesium ammonium phosphate, cystine and purine stones, depending on their composition. Most stones can be a mixture of two or more components. The characteristics of various stones are as follows: (1) Calcium oxalate stones account for 80% to 84% of stones, often yellowish brown or stone copper color, smooth surface (calcium oxalate monohydrate), rough (calcium oxalate dihydrate), male onset is common, mostly with family history, clearly visible on x-ray. There are often calcium oxalate crystals in the urine sediment. (2) Calcium phosphate stones: accounting for 6% to 9% of the stones, the stones are white, rough surface, often antler-shaped, hard texture. They are often formed in alkaline urine. They are common in young and middle-aged men, with a family history, and are clearly visible on x-ray. (3) uric acid (urate) stones: 6%-10% of stones, smooth surface, often antler-shaped, yellow or brown, hard texture, blurred on x-ray or can not appear. They are more common in men, especially in gout patients, and usually have a family history. Uric acid crystals are visible in the urine sediment. (4) magnesium ammonium phosphate stones: accounting for 6-9% of the stones, stones yellow or dirty gray, dendritic or antler-shaped, soft texture. To women are more common, more patients with urinary tract infection, can not pass x-ray. The crystals of magnesium ammonium phosphate can be seen in the urine sediment. (5) Cystine stones: less than 2% of the stones, yellow or white, smooth surface, round, not easy to transmit x-ray, often formed in acidic urine. Cystine crystals can be seen in the urine sediment. (6) Xanthine stones: These stones are rarely seen, white or yellowish brown in color, brittle in texture, not easily transmitted by x-ray, and usually formed in acidic urine. Among the above mentioned stones, uric acid stones, cystine stones and purine stones do not show up on x-ray because they contain little calcium, which is also called “negative stones”. Patients need to collect the specimens after the stones are removed from the body and submit them to the physician for composition analysis to prevent the recurrence of stone disease.