Deep vein placement is a common clinical infusion and treatment measure, which can be used for chemotherapy drug infusion through deep vein placement or dialysis of patients through deep vein placement. The steps of tube-sealing are as follows: 1. Assess the patient’s specific situation, explain the purpose of the operation to the patient, prepare the instruments after obtaining the patient’s consent, keep the surrounding environment dry, clean and warm, and also protect the patient’s privacy; 3. The catheter should be disinfected and the catheter should be fixed to avoid dislodging.