The “pre-operative four” for hemorrhoid surgery generally refers to the investigation of some relevant infectious diseases, for patients suffering from some infectious diseases, surgical treatment, the post-operative device elimination and pre-operative surgical pavement, in the hospital will have strict requirements. The four preoperative tests include pathogenic tests for hepatitis B virus, hepatitis C virus, AIDS and syphilis. In addition, there are some related tests that need to be done before surgery, such as routine blood, coagulation, liver and kidney function, as well as ECG and chest X-ray. Although hemorrhoid surgery is a minor surgery, it is after all a surgery. So there are some necessary pre-operative tests that should still be done to avoid causing some unexpected situations that can lead to serious consequences.