Rheumatic diseases often involve bones, joints and their surrounding soft tissues, and imaging is an important aid in the diagnosis and treatment of rheumatic diseases. For a long time, X-ray radiographs have been the most commonly used means of clinical imaging detection, but this method has poor sensitivity and is unable to achieve early diagnosis. MRI is expensive and difficult to promote in the clinic for the monitoring of rheumatic disease activities. In recent years, ultrasound of musculoskeletal system is developing into a new field of ultrasound application both at home and abroad, which is welcomed by clinics and patients due to the convenience, rapidity, real-time monitoring, no radiation and low cost of ultrasound examination. Musculoskeletal ultrasound has become an important part of the diagnosis of rheumatic diseases. Compared with traditional X-ray, CT, and MR, energy Doppler ultrasound has an irreplaceable role in the diagnosis of muscle, tendon, ligament, and periarticular soft tissue diseases, and its diagnostic value is even superior to that of MRI in many aspects. Energy Doppler demonstrates the synovitis of the wrist in rheumatoid arthritis.