Patients suffering from acute deep vein thrombosis need bed rest for 1 to 2 weeks to keep the thrombus tightly adhered to the intima, to reduce local pain, and to promote the inflammatory response to subside. During this period, avoid exertion to prevent thrombus dislodgement leading to pulmonary embolism. The affected limb should be elevated above the level of the heart, about 20-30 cm above the bed, and the knee joint should be placed in a slightly flexed position. If the elevation is appropriate, it is not necessary to use elastic bandage or wear elastic stockings. When you start to get up and move around, you need to wear elastic stockings or elastic bandages to moderately compress the superficial veins to increase the venous return flow and maintain the minimum venous pressure to stop the development of lower limb edema. The use time of elastic stockings: 1. For thrombophlebitis of deep or superficial veins of calf, it is generally not needed, but if edema appears in ankle and lower calf, it can be used for several weeks; 2. For N and femoral vein thrombosis, it is generally used for no more than 6 weeks; 3. For iliofemoral vein thrombosis, it is used for 3 months first, and then removed intermittently, generally no more than 6 months, but if edema appears, it is necessary to continue to apply. Patients in the early stage, it is forbidden to stand and sit for a long time. For patients with heavy iliofemoral vein thrombosis, appropriate restrictions on standing and sitting, and elevation of the affected limb for 3 months, which can promote the establishment of collateral veins in the lower limbs to reduce lower limb edema.