Preparation for the evacuation surgery includes knowing the precautions related to the surgery in advance, and doing the auxiliary examination. Clearance surgery is generally used for termination of pregnancy, treatment of hyperemesis gravidarum, and so on. Before the operation, one should be psychologically prepared and understand the purpose of the operation and the related risks. Relevant auxiliary examinations are also required. It includes ultrasonography, routine vaginal secretion, blood routine, and coagulation related examinations. Temperature, pulse and blood pressure need to be measured before surgery. Perfect examination can help to exclude contraindications to surgery, help to understand and confirm the diagnosis of the condition, if there are indications for surgery and no contraindications, surgery can be performed. If there is any discomfort, it is recommended to seek medical advice promptly.