Male catheterization precautions are to explain the purpose of the operation, the presence of prepuce need to open the foreskin, fully lift the penis, catheterization length, reasonable diet. 1. Male catheterization is a common clinical operation, usually, in the male catheterization need to pay attention to first explain the purpose of the operation, mainly to obtain the cooperation of the patient, to eliminate the patient’s panic and doubt. 2. For patients with prepuce, the operation process needs to pay attention to open the foreskin. Remove the foreskin scale and expose the urethral opening completely. After catheterization, the foreskin should be reset so as not to cause encrustation of the foreskin. 3. Because the male urethra has three narrowings and two bends, so when catheterizing, the penis needs to be lifted up fully, and the angle should be adjusted appropriately for the urethra to rise up into the enclosure. In addition, because the male urethra is longer than that of the female, attention needs to be paid to inserting the catheter into the urethra fully, and injecting the balloon in the area of the bladder after it has been entered. 4. After the male end of catheterization, in the diet need to pay attention to eat more fresh fruits and vegetables, reasonable combination of meals, avoid eating spicy stimulating food. In summary, men in the process of catheterization to give some cooperation, to prevent adverse effects.