When the patient has fluid in the knee, it is still possible to actively carry out hot compresses. The main purpose of hot compresses is to promote local blood circulation, thus effectively promoting the rapid absorption of fluid, usually apply hot water bags, salt bags for hot compresses can be. In addition, in order to promote the rapid absorption of fluid, you also need to do the following: First, rest is very critical, minimize the stimulation of the knee joint, otherwise it will make the patient’s clinical symptoms worse. Second, if the patient is accompanied by knee joint swelling and pain, it is also necessary to use some local topical creams to activate blood circulation and remove blood stasis, and oral non-steroidal anti-inflammatory and analgesic drugs and drugs to activate blood circulation and remove blood stasis to carry on the treatment. Third, for the joint fluid is very much, you can actively hollow needle puncture fluid extraction, but must pay attention to the aseptic operation, to avoid causing infection in the joint.