The common causes of hip joint effusion include hip synovitis, osteomyelitis, ischemic necrosis of femoral head, etc. The cause should be treated, such as application of drugs, surgical treatment, etc. There is no optimal elimination method at present. For hip synovitis, non-steroidal anti-inflammatory drugs such as ibuprofen can be taken orally as prescribed by the doctor, which can control the inflammation and reduce the symptoms; when the conservative treatment is ineffective, surgery can be taken to remove the synovial membrane embedded in the joint in a timely manner. For osteomyelitis, complete removal of the lesion, open cancellous bone grafting and repeated irrigation can be considered. For those caused by ischemic necrosis of the femoral head, the condition should be closely observed and weight bearing should be avoided; if the physical condition permits, medullary decompression, bone grafting, osteotomy arthroplasty, etc. can be considered. It is suggested that people with hip joint effusion should go to regular hospitals in time, clarify the cause of the disease, and carry out standardized treatment under the guidance of doctors, so as not to delay the condition.