A Study of the Efficacy and Safety of SHR-1314 for Adult Active Psoriatic Arthritis

Who May Qualify: 1. The subject voluntarily signs an willing to sign a consent form form before any procedures related to the research start; 2. At the time of screening, it met the 2006 psoriatic arthritis classification standard (CASPAR)； 3. There is active PsA before randomization; 4. Have active plaque psoriasis (at least one plaque skin lesion) at the time of screening, or have a history of plaque psoriasis; 5. Participants who have previously been treated with csDMARDs and/or NSAIDs still have active psoriatic arthritis disease. Who Should NOT Join This Trial: 1. Existence of any of the following medical history or comorbid diseases: drug-induced psoriasis; other active inflammatory diseases or autoimmune conditions (where your immune system attacks your own body)s; history of organ transplantation; history of lymphocytic proliferation; severe infections, etc. 2. Have received psoriatic arthritis or psoriasis drugs, such as intra-articular injections, plant preparations, etc. within a certain period of time in the past. 3. Those who are allergic to the drug ingredients or excipients in this study, or are allergic to other biological agents. 4. A history of alcohol abuse or illegal drug abuse in pregnant or breastfeeding women, etc. Always talk to your doctor about whether this trial is right for you.