Study of Jitongning Tablet to Treat Spondyloarthritis

Inclusion Criteria: * Men or women aged 18 to 65 years old (including 18 and 65) ; * Meeting the diagnostic criteria for active axial SpA according to the the ASAS classification 2009, defined as satisfied 2 of the following: 1. BASDAI score ≥ 4; 2. In the assessment of pain numerical rating scale (NRS), spine pain NRS ≥ 4; * Meeting the standard of TCM syndrome diagnosis for kidney yang deficiency and biood stasis stagnating syndrome; * Sacroiliac arthritis of CT categories I(A)\~Ⅲ(B) (including I(A) and Ⅲ(B)); * Human leukocyte antigen B27 (HLA-B27) is positive; * C-reactive protein (CRP)/hypersensitive C-reactive protein (hsCRP) and/or erythrocyte sedimentation rate raised; * Voluntary signing of informed consent. Exclusion Criteria: * Those who use NSAIDs in the first 2 weeks of randomization; * In the first 4 weeks of randomization, take disease-modifying antirheumatic Chinese herbal medicine or Chemical drugs (such as sulfasalazine ,methotrexate, leflunomide, Chloroquine, Total glycosides of Tripterygium, Cyclophosphamide, Azathioprine, etc),opioid analgesics(Methadone, Morphine, etc.) ,systemic glucocorticoid therapy; * In the first 3 months of randomization, take biological agents that have been used for spinal arthritis; * Those who have undergone spinal surgery or joint surgery within 8 weeks before randomization; * Patients who received intra-articular injection, spinal or paravertebral injection of corticosteroids within the first 6 months of randomization; * The spine is completely stiff (fused); * Any Other rheumatic immune system diseases or immunodeficiency syndromes such as ulcerative colitis, psoriasis, uveitis, etc. * Those who have a fertility requirement within 6 months; * Women during pregnancy and lactation; * Suspected or indeed drug use, substance abuse, alcoholism; * In the first 3 months of randomization, take the test or in progress; * Serious cardiovascular, Liver , kidney, brain, mental, neurological disorders that affect informed consent and/or adverse event expression or observation; * Abnormal liver function(the AST or ALT value is above the upper limit of the normal); Abnormal renal function (serum creatinine is above the upper limit of normal); * Due to other circumstances, the investigator considered it inappropriate for the participants.