Coronary artery CT examination is one of the means to assess whether there is any abnormality in the coronary artery vessels, and the precautions should be divided into before the examination, during the examination and after the examination, and standardized operation under the guidance of the doctor. 1. 12 hours before the coronary artery CT examination should be prohibited from taking coffee, alcohol and other items, and stop using nephrotoxic drugs within 48 hours. Wear clothes as loose as possible, mainly cotton clothes to avoid static electricity. On the day of the examination, do not exercise substantially, stabilize the heart rate, and drink less water. Before entering the examination room, you need to remove any metal objects and cell phones you are wearing. 2. During the examination, you may experience pain, stuffiness, itching and other discomforts, so you need to remain still. Cooperate with the machine and the doctor’s instructions. 3. After the coronary artery CT examination, you need to drink a lot of water to promote the discharge of contrast medium. When the condition requires improvement of coronary CT, relevant preparations should be made according to the doctor’s instructions, so as to avoid large deviations in the examination results.