Prevention of thrombosis is generally clinically divided into two types of prevention: 1. Physical prevention: prevention includes ways to increase the activity of the affected limb to avoid blood stagnation leading to thrombosis. You can wear elastic stockings to promote blood flow back to the lower extremity and increase the blood flow rate to prevent thrombosis, and you can also prevent thrombosis through local massage and physical therapy. In the prevention of thrombosis, these three methods are more commonly used in clinical physical therapy; 2, drug prevention: drug prevention can be clinically divided into oral drug prevention, such as warfarin, rivaroxaban and other new anticoagulants. In addition, drug injection during hospitalization, through subcutaneous injection of low-molecular heparin calcium these drugs to achieve the prevention of thrombosis.