Index of effect evaluation: 1) Articular ultrasound, OMERACT-EULAR composite PDUS synovitis score will be used to evaluate the condition of articulation; 2) Disease activity score, DAS28-CRP, DAS28-ESR; 3) Health Assessment Questionnaire, HAQ; 4) Rheumatoid and arthritis outcome score, RAOS; 5) composite change index, CCI score; 6) diameter of knee joint; 7) knee flexion range.