Arterial thrombosis in the legs is divided into arterial thrombosis and venous thrombosis, and arterial thrombosis in the legs has no strict limitation on walking exercise, and proper walking exercise is helpful to improve the symptoms of lower limbs. Only in the case of venous thrombosis of the lower extremities, the walking time is limited. This is mainly due to the fact that in the acute stage of venous thrombosis, the venous thrombosis is still unstable and there is always a risk that the thrombus will dislodge and cause pulmonary embolism and death, so the time spent away from bed should be strictly limited. For venous thrombosis with a history of more than 2-3 weeks, if the thrombus is gradually stabilized and changes from acute to subacute to chronic stage, bed release can be performed as appropriate, but strictly speaking, it should be clarified by combining laboratory tests and ultrasonography. If the D-dimer has returned to normal and the ultrasound indicates that the thrombus has changed to subacute or chronic stage, it is more scientific and safer to leave the bed appropriately.