The function of drug-coated coronary balloon catheters is to dilate blood vessels, inhibit stenosis, and prevent restenosis after dilation. Drug-coated balloon, also known as drug balloon, is based on the ordinary balloon, the balloon contraction of the drug will be coated on the surface of the balloon, the drug balloon is placed in the blood vessels, the balloon dilation, the drug contact with the blood vessels, it will be released into the blood vessels, to facilitate the drug to play a role directly in the vascular lesions, so that the balloon dilation of the effect of the balloon is more durable, you can effectively prevent blood vessel stenosis or constriction and so on. Compared with the drug balloon, ordinary balloon without drug action support, easy to appear blood vessel rebound, narrowing and so on, expanding blood vessels for a short period of time. Drug balloon has limited scope of application, and there are many complications. It is recommended that patients should have regular postoperative checkups, take medication as prescribed by the doctor, and carry out standardized operation under the guidance of professional doctors.