Old lower limb venous thrombosis can be treated with Taohong Siwu Tang, Dioscorea Dioscorea and Dampness-expanding Tang, Tonifying Yang and Returning Five Tang, Yanghe Tang and so on. Lower limb venous thrombosis will cause blood return obstruction, the affected limb will be suddenly swollen and painful, at the same time, the tension of the leg will increase, there is a feeling of tightness, and the affected side can be found to be thicker than the healthy side under close observation. Chinese medicine is categorized into two types after identification and treatment. 1. Dampness-heat obstruction, qi stagnation and blood stasis (blood stagnation due to lack of qi circulation), clinical manifestations of the affected limb swelling, burning, leg pain, immobilization, fever, to regulate qi and activate blood circulation, clearing heat and eliminating dampness (removing heat and dampness in the body) as the treatment principle. The treatment principle is to regulate qi and activate blood, clear heat and remove dampness (remove heat and dampness from the body). 2. Qi deficiency and blood stasis, cold-dampness stagnation syndrome, manifested as swelling of the affected limbs that does not subside for a long time, with purple color of the skin, blue veins showing, not hard when pressed, and no obvious concavity. To benefit the qi and blood (tonifying qi and blood, so that the body is full of qi and blood, blood flow), Tong Yang water as the treatment. It can be treated with the addition and subtraction of Yang-restoring Five Soup and Yang-he Soup. If you have symptoms, you should take medication under the guidance of a professional doctor, do not take medication blindly on your own, in order to avoid delaying the condition or producing adverse reactions.