High urinary flow leukocytes often indicate the presence of a urinary tract infection. Urinary tract infection is a very common disease in clinical practice, causing urinary tract infection is generally common in bacterial infections, the most common pathogenic bacteria are mainly Escherichia coli, Staphylococcus, etc.. The common route of infection is through the urethra, when the immunity of the body is low, the pathogenic bacteria enter the bladder mucosa through the urethra, causing inflammation of the bladder, and if the disease develops further, it can cause infection of the pelvis and ureter. In addition, some patients may have urinary tract infections due to hematogenous spread, caused by foci of infection in other parts of the body that have spread through the bloodstream. For urinary tract infection, it often causes clinical symptoms such as frequent, urgent and painful urination, and if there is upper urinary tract infection, it usually also causes systemic manifestations such as low back pain, chills and high fever, which need to be treated actively.