Inclusion Criteria:  aged 18 years or older,; had received a diagnosis of psoriatic arthritis at least 6 months previously, fulfilled the Classification Criteria for Psoriatic Arthritis (CASPAR); had at least 1 active enthesitis (confirmed by ultrasound) ; had active arthritis (at least 3 tender/painful and 3 swollen joints) ; had active plaque psoriasis (there was no criteria for minimum psoriasis severity) at screening and baseline.  Exclusion Criteria:  History of surgery or trauma at the site examined by ultrasound (hand, elbow, knee, ankle, etc.); Local injection of glucocorticoids or other drugs at the site examined by ultrasound in recent 6 weeks; Peripheral neuropathy; Use of IL-17 or IL-12/23 inhibitors in the last 12 months;Use of infliximab, adamumab, golimumab, and cetuzumab in the last 10 weeks;PUVA treatment for the last 4 weeks;Use of topical treatment or UVB phototherapy that may have an effect on psoriasis in the last 2 weeks; recent history of severe, progressive, or uncontrolled renal, hepatic, hematological, gastrointestinal, metabolic, endocrine, pulmonary, cardiovascular, or neurologic disease; evidence of active or latent or inadequately treated Mycobacterium tuberculosis; aspartate transaminase (AST) or alanine transaminase (ALT) >3x upper limit of normal (ULN) at screening; estimated creatinine clearance <40 mL/min.