Inclusion Criteria:  Male or female subjects aged 18 to 75 years (time of get informed consent) Documented diagnosis of rheumatoid arthritis, as defined by the American Rheumatism Association 1987 Revised Criteria. Documented diagnosis of damp-heat syndrome according to Traditional Chinese Medicine. If patients are receiving Disease-modifying anti-rheumatic drugs (DMARDs), then the doses should have been kept stable for at least 12 weeks. If patients are receiving non-steroidal anti-inflammatory drugs (NSAIDs) or orally Chinese herbal medicine, then the doses should have been kept stable for at least 4 weeks.  Exclusion Criteria:  Skin allergies or broken skin; Taking glucocorticoids,more than 10 mg daily. Female patients who are pregnant, breast-feeding or planed to be pregnant;