Connect the extension tube after successful intravenous injection. Select the speed of drug delivery according to the condition and nature of the drug. Press the start button, the visible injection indication mark rotates. Check whether the instructions are in working condition. Strict "3 Checks and 7 Rights" and aseptic operation are carried out, and the syringe needs to be changed every time the drug is aspirated. In order to prevent air from being pressed into the blood vessel, the gas should be expelled when the drug is aspirated. Before the drug in the syringe is about to be injected, the drug solution should be pumped in advance for timely replacement to maintain the continuity of the use of drugs. After the opening of the injection, timely check whether the drug leakage, such as alarm should be timely to find the cause, make appropriate treatment. Common causes of alarm are detachment of the tube, pressure or distortion of the pipe, separation of the slide base and syringe, and completion of the injection of the drug. When using the drug parameters [μg/(min-kg)] accurately converted to the pump's fixed input parameters (ml/hour), and then entered into the pump display. When using light-sheltered drugs such as sodium nitroprusside, the pipeline should be covered with light-sheltered paper to ensure drug potency. Timely cleaning of the pump surface dirt, residual liquid, to prevent corrosion of the machine, after use by a person to keep.