Inclusion Criteria:  According with the diagnosis of axial spondyloarthritis (axSpA) by the Assessment of Spondyloarthritis International Society (ASAS);, During the screening period, the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) ≥ 4 points and the Spinal Pain (BASDAI Article 2) NRS score ≥ 4 points;  Exclusion Criteria:  Previous or current Crohn's disease; Suffering from ulcerative enteritis and requiring immunosuppressive therapy at present;