Child urinary catheterization is a treatment modality in which a catheter is inserted into the bladder through the child’s urethra to expel urine. The main indications for children’s catheterization is used to relieve children’s urinary retention, vital signs of critically ill patients, urine specimens for bacteriological culture or examination, urinary system or general anesthesia after surgery routine care, etc.; contraindications are acute urethritis is prohibited. Children’s urinary catheterization is relatively difficult compared to adults, must choose smooth and relatively thin catheter to reduce the trauma to the child. Strict asepsis is required during the procedure, and movements should be as gentle as possible to avoid damage to the urethral mucosal tissue. In addition, it is recommended to reasonably expose the child during the operation to prevent the child from catching cold, and pay attention to skin care after the operation to avoid skin eczema. In conclusion, urinary catheterization should be performed by a professional physician, and if there is any discomfort, consult a doctor promptly.