Objective To investigate the clinical effect of Extraction of Bone-melon Injection on rheumatoid arthritis.Methods 60 patients with rheumatoid arthritis admitted in our hospital from May 2013 to August 2014 were selected and randomly divided into two groups, the control group and the treatment group with 30 cases in each by the random number table. Both groups were given the conventional treatment for rheumatoid arthritis, in addition, the treatment group were given Extraction of Bone-melon Injection. Conti...