The normal value of urine pH is about 6.5, fluctuating between 4.5 and 8.0. The pH of urine, affected by disease, medication and diet, can turn acidic urine into alkaline urine when urine is left for too long and bacteria decompose urea, while the influence of dietary structure, the pH of urine can also have a large physiological change, meat-based people, urine is acidic, and lodging-based people urine is alkaline, urine pH Decrease in urine pH is seen in acidosis, hyperthermia, gout, diabetes and oral administration of acidic drugs such as ammonium chloride and vitamin C, while increase in urine pH is seen in alkalosis, urinary retention, cystitis, application of diuretics, renal tubular acidosis, etc. Using the pH of urine can be intervened to treat some diseases, for example, acidifying urine with ammonium chloride can induce alkaline drug intoxication to be excreted from the urine, while using sodium bicarbonate to alkalize urine can induce acidic drug intoxication to be excreted from the urine.