Knee effusion indicates that the knee is in the stage of local injury tissue exudation, at this time it is not appropriate to carry out rehabilitation training with high sports volume or high sports load, physical therapy should be carried out first, such as wafer light irradiation, wax therapy, etc., to promote the absorption of inflammation, and then carry out rehabilitation training after the effusion is significantly reduced or eliminated. The methods of rehabilitation training are as follows: i. Manipulation to improve function: such as massage therapy, mainly through the combination of pushing, kneading, patting and pounding to relieve the effusion at the joint. II. Movement to restore function: 1. Pad something under the knee joint and gradually increase the range of motion of the knee joint, but the movement must be slow to avoid overloading the knee joint; 2. Lie on the bed, lift the leg up and use both hands to put the calf against the thigh area, and the movement of the whole process must also be gentle.