Joint musculoskeletal ultrasound is a new technology that has been gradually developed in China in recent years, with the function of simple and efficient evaluation of arthritis, which helps in the early diagnosis and evaluation of various arthritis, and is increasingly performed in the rheumatology departments of large hospitals, as an effective alternative or complement to the expensive MRI technology. It is inexpensive, simple to perform, fast, non-invasive, non-radioactive, can be repeatedly reviewed and followed up within a short period of time or irregularly, and can be used to evaluate arthritis changes in a timely manner. The doctor can interpret the abnormal findings to the patient on the spot, so that the patient can understand his or her condition more clearly and objectively in real time. It can identify early fluid accumulation in the joint cavity, synovial hyperplasia and inflammatory reactions, detect erosion and destruction of the joint surface with sensitivity, quickly detect the presence of gout crystals, and even accurately identify tendonitis, tenosynovitis, bursitis, and swelling of the soft tissues and muscles of the skin, which are difficult for doctors to determine on clinical examination, thus helping to diagnose and differentially diagnose various kinds of arthritis, including rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis, gout, pseudogout, osteoarthritis, tenosynovitis, rheumatic polymyalgia, infectious arthritis, connective tissue disease, and various other arthritis. It can not only be used for rapid diagnosis of various typical arthritis, but also for various patients with atypical clinical manifestations and auxiliary examinations, it can help doctors to make differential diagnosis as soon as possible, so as to avoid missed diagnosis and misdiagnosis to the maximum extent, and it is the right assistant of rheumatologists. It can also help doctors to regularly review and accurately observe changes in the condition during the treatment phase after diagnosis, so as to timely adjust the treatment plan and give patients more reasonable and scientific drugs and doses to avoid under- or over-treatment. Especially for patients with rheumatoid arthritis, recent studies have found that although some patients do not have any subjective sensation of joint swelling and pain after treatment, there is still persistent synovial inflammation on objective imaging, which is a potential cause of persistent joint bone destruction in the future, and joint ultrasound can accurately determine the existence of this “subclinical Synovial ultrasound can accurately determine the presence of this “subclinical synovitis” and alert patients and physicians to continue to intensify therapy, rather than withdrawing medications or reducing dosages in a reckless manner. It allows early identification of rapidly progressive bone erosion and destruction of the joint, and thus allows physicians to use early and aggressive treatment to delay or prevent further deterioration of the disease. In conclusion, articular musculoskeletal ultrasound is a very simple and efficient new technique for identifying arthritis, which has great value for popular application and is a good assistant for rheumatologists, bringing benefits to patients with various types of arthritis.