Artificial kidney is both hemodialysis, the average life expectancy of uremic patients doing hemodialysis in China is about 10~15 years. When patients are diagnosed with uremia, they need to do renal replacement therapy, artificial kidney that is, hemodialysis is a kind of renal replacement therapy, the survival life span of uremia patients who do hemodialysis varies greatly among individuals, and the time of survival is closely related to the patient’s age, the condition of the underlying disease, and whether or not dialysis is regular and sufficient, etc. If the patient is not very serious, the patient is relatively young, in good physical condition, the dialysis is regular and sufficient. If the patient’s underlying disease is not very serious, the patient’s age is relatively young, the patient’s physical quality is good, and the dialysis is sufficient, so the patient’s survival time is relatively long, and the survival time can be more than 15 years, and it is known that hemodialysis patients can even be dialyzed for 40 years and still be able to survive. If the patient’s underlying disease is heavier, the physical quality is poorer, the age is older, plus the dialysis is not sufficient, this kind of patient dialysis time is shorter, some patients even a few weeks will lead to death.