There are many TCM treatments for knee effusion. Generally, it depends on the cause of the knee effusion first. It should first be divided out as deficiency, actual, cold, heat, new or old. If it is a fresh injury, an acute phase injury, an edematous effusion has appeared in two days of injury, and it is considered to be caused by trauma, it can be treated symptomatically with Blood Mansions and Stagnation Tang. If it is longer, the local tissues are hotter, the skin temperature is high, and the local tissue pain is more severe, one should differentiate to see the moss pulse. If phlegm-dampness stasis is blocked, there is a very good method called Si Miao San plus or minus treatment. If it is the type of Qi stagnation and blood stasis, treat it symptomatically with Blood Mansions and Blood Stasis Soup, distinguish deficiency, actual, cold, heat, new and old, resulting in joint cavity effusion, and add or subtract symptomatic drugs. In addition to the above drug treatment methods, we also need to cooperate with appropriate braking and traction, and we can also apply Chinese herbal hard ointment externally, together with physical therapy such as Chinese herbal fumigation treatment, all of which are very reasonable and effective treatments for knee joint effusion. These comprehensive treatments are very effective and scientific treatments for knee effusion. Single therapy is not ideal for knee synovial effusion, so a comprehensive consideration of the condition is necessary to analyze the specific plan and then do symptomatic treatment.