For example, the amount of pure fat aspiration is less than 3000ml, for some overweight patients, the amount of liposuction should be less than 5000ml, and the best age for surgery should be less than 50 years old. Those over 50 years old should pay attention to whether there is primary disease. Relevant standards also suggest that no more than three parts should be sucked at a time. In addition, the standard puts forward scientific suggestions on fluid replacement, anesthesia dosage, swelling fluid dosage, operation speed and time.