The ion content in human urine can reflect the metabolic level of the body and potential disease risks. For example, urinary tract stones  are a common and frequently  occurring disease  in daily  life, with  calcium oxalate,  calcium phosphate stones, and magnesium ammonium phosphate stones accounting for more than 95%. An increase in the concentration of crystals  in  urine, such as  oxalates  and  phosphates,  can  lead to the  precipitation of crystalline substances and the formation of stones; The pH value of urine can affect the degree of crystal solution, and alkaline urine is conducive to the formation of calcium phosphate, magnesium ammonium phosphate, and calcium oxalate stones; Citric acid and its salts are important inhibitory factors for urinary tract stones. Therefore, monitoring the concentrations of oxalic acid, phosphate, and citric acid in urine is crucial for studying and diagnosing urinary tract stones.