Most paraplegic patients will have problems with urination, such as straining to urinate, incomplete urination, leakage, and holding urine. This is triggered by damage to the nerves that innervate the bladder and urethra, known as neurogenic bladder, and is clinically classified into different types such as spastic and flaccid bladder, detrusor muscle, and uncoordinated function of the urethral sphincter. Due to the lack of bladder holding sensation and/or the inability of the urethral sphincter to relax during urination in paraplegic patients, the patient cannot feel and cannot properly expel urine no matter how much urine is held in the bladder and how high the pressure in the bladder is. All the patient can feel is the constant leakage of urine and mistakenly believes that as long as there is urine flowing out, it is not a big problem, and it is precisely this misconception that has laid a major safety hazard for paraplegics. The leakage of urine is like the tip of the iceberg, and the residual urine in the bladder is like a huge ice body under the ocean. The direct consequence of this hidden danger is that the life of paraplegic patients is greatly threatened, and the continuous high pressure in the bladder caused by continuous bladder holding is the biggest reason for this hidden danger, and the continuous high pressure in the bladder successively affects the function of ureter and kidney, and at this time, long-term continuous damage to kidney function is formed. If the high pressure in the bladder persists within a year, 100% of the patients will suffer damage to their kidney function, and for a longer period of time even uremia will develop, which is precisely one of the key factors affecting the long-term survival of these patients. Due to the high priority given to these problems by the foreign medical community, the mortality rate of spinal cord injury patients has been significantly reduced year by year since World War I, and is now close to the level of the normal population. In China, according to the investigation on the causes of death of Tangshan earthquake patients 15 years later, 49%-66% are related to uremia, but this problem has not yet attracted the attention of the domestic medical community, and look around us how many paraplegics are on uremic dialysis, which can not be said to be a major regret of the domestic medical community, especially rehabilitation medicine, because the above-mentioned situation can be completely avoided through appropriate treatment, especially at the early stage of treatment. This can be avoided by proper treatment, especially at an early stage. In conclusion, the threat of limb dysfunction to life is much less than that of urinary tract system dysfunction, so paraplegics must pay full attention to the rehabilitation of internal organs, especially the urinary tract system, while paying attention to the rehabilitation of limbs.