The natural ways to get rid of fluid in the knee are rest, localized hot compresses, in addition to the use of anti-inflammatory and analgesic medications, puncture needles, and medication injections. 1. Rest: If the patient has knee trauma, inflammation or degeneration, the water in the knee will increase and become waterlogged. The patient can promote the absorption of water in the knee by resting properly and reducing the activity of the knee. 2. Localized hot compresses: patients can use hot water bags, hot towels and other localized hot compresses, or short and medium wave thermotherapy to promote the absorption of fluid in the knee, so that the fluid can be reduced. 3. Anti-inflammatory and analgesic drugs: patients can use non-steroidal anti-inflammatory and analgesic drugs such as Loxoprofen sodium tablets and diclofenac diethylamide cream as prescribed by the doctor, which have the effect of anti-inflammatory and analgesic, and can also reduce the fluid accumulation in the knee. 4. Puncture needle: this method needs to be operated by professional doctors in regular hospitals, using a puncture needle to pump water to the knee, paying attention to sterilization to prevent infection. 5. Drug injection: If there is a large amount of fluid in the patient’s knee, glucocorticoid drugs such as cotrimoxazole injection can be used for injection, which can treat synovial inflammation of the knee and reduce the fluid in the knee. Patients who still have fluid in the knee after resting and applying localized hot compresses need to go to the hospital to do relevant examinations and cooperate with doctors for targeted treatment and therapy.