Rheumatoid arthritis is a chronic disease, often occurring in the middle-aged and elderly population, rheumatoid arthritis can affect the life and work of patients. The following are the methods of diagnosis of rheumatoid arthritis. 1, rheumatic fever activity indicators: including increased sedimentation, increased white blood cell count and neutrophils, increased alpha 2 globulin and mucin, positive C-reactive protein, etc., but can only reflect the activity of the disease, and is not specific for the diagnosis of the disease. 2. Evidence of streptococcal infection: ASO is elevated in 80% of children with rheumatic fever. Simultaneous determination of anti-deoxyribonuclease B (Anti-DnaseB), anti-streptococcal kinase (ASK), and anti-hyaluronidase (AH) increases the positivity rate to 95%. Pharyngeal swab culture can detect group A type B hemolytic streptococci. Serum anti-streptococcal hemolysin O (ASO) titers begin to rise one week after streptococcal infection and gradually decrease after two months. A lot of information on the Internet confuses rheumatoid arthritis with rheumatoid arthritis, which is a very serious mistake.