A Clinical Study of Xin'an Medicine in the Treatment of Bi Syndrome

Inclusion Criteria: * Diagnosis of RA, classified by American Rheumatism Association 1987 revised criteria. * According with the Zheng diagnosis of Traditional Chinese Medicine. * age from 18 to 65 years. * For patients currently receiving non-steroidal anti-inflammatory drugs (NSAIDs): Treatment at a stable dose during last 4 weeks prior to screening，or Patients do not take NSAIDs at least 1 weeks prior to screening. * Patients not taking DMARDs at least 4 weeks prior to screening. * Patients taking corticosteroids (≤15mg prednisone or Equivalent) ≥4 weeks before entering the trial. * Patients agree to participate in this study and sign the informed consent form. Exclusion Criteria: * Patients have received intra-articular or systemic corticosteroid injection within 4 weeks of screening. * Patients have high disease activity (DAS28-3 scores\> 5.1). * Patients have diagnosed any other chronic inflammatory disease or connective tissue disease like sicca syndrome（SS）, systemic lupus erythematosus (SLE)etc; * Patients with sever diseases in Cardiovascular, brain, lung, liver, kidney and hematopoietic system ; * Patients who are pregnant or nursing mothers or Psychiatric patients. * Patients with active gastroduodenal ulcer or gastritis which caused by long-term use of NSAIDs; * The patient who has known hypersensitivity to trial medicine . * Patients have participated in other clinical trials within 4 weeks of screening.