The diagnosis of rheumatoid arthritis is usually confirmed by checking the following indicators: rheumatoid factor, inflammation indicators and joint X-ray. However, other ancillary tests that provide important diagnostic clues are also essential. The diagnostic criteria for rheumatoid arthritis include seven diagnostic criteria, including patient’s symptoms, medical history, signs and symptoms, rheumatoid factor and X-ray, etc. The diagnosis of rheumatoid arthritis can be confirmed by fulfilling four or more of the seven diagnostic criteria, with the presence of bone erosion or osteoporosis in the hand and wrist X-ray of the patient and a positive rheumatoid factor being two of the criteria. In addition, CRP, blood sedimentation, autoantibodies, urine routine, blood routine, MRI, joint ultrasound, CT, and other auxiliary tests to understand the patient’s systemic complications and the degree of inflammation of the disease are also essential. The diagnosis of rheumatoid arthritis should be made by professional doctors, and it is recommended that patients go to the rheumatology and immunology department of regular hospitals to actively cooperate with the doctors and consult them accordingly.