The treatment of thin blood vessels, which are not good for lancing, is as follows: 1. To choose a relatively straight and thick blood vessel, you can choose a blood vessel of the arm for lancing, for example, you can choose the brachial vein, because this vessel is relatively thick. If the superficial cannot be seen, this vessel can be found through ultrasound.2. Infusion can be done through a deep vein, for example, a tube can be placed in the femoral vein, or in the subclavian vein or internal jugular vein, and an infusion tube placed in a deep vein can make the liquid enter directly into the deep vein, avoiding repeatedly tying the liquid in superficial and fine vessels, and then the occurrence of vasculitis can be avoided.3. If the patient If the patient needs long-term infusion, the infusion port can be implanted through the deep vein, which can avoid repeatedly tying the liquid in the peripheral blood vessels, which can also affect the patient’s treatment due to bad tying.