Urine protein weak positive is not necessarily nephritis, there are functional factors such as strenuous exercise, etc., but also pathological factors such as nephritis, urinary tract infections, urinary tract stones and so on. 1. Functional factors: strenuous exercise, cold, mental stress, sympathetic nervous excitement and the use of vasoactive drugs and other factors, renal vasospasm or congestion leading to increased permeability of the tubular filtration membrane and a large number of protein “leakage” formation of proteinuria, these are not diseases are functional, in the causative factors can be lifted by itself. The problem of proteinuria is not a disease, it is functional and can disappear on its own after the triggers are removed. 2. Urinary tract infection, urinary stones: this situation has a direct relationship with the infection, may also lead to weak positive urine protein. 3. Nephritis: glomerular proteinuria, tubular proteinuria and other renal diseases that affect the renal filtration rate and reabsorption function leading to proteinuria, nephritis patients often have protein, red blood cells in the urine, according to the clinical manifestations as well as the laboratory examination of a combination of several aspects in order to confirm the diagnosis. Urine protein weak positive patients to the regular hospital in a timely manner, according to the clinical manifestations and laboratory tests, clear cause of the disease, follow the doctor’s instructions targeted treatment.