Study of the Effectiveness and Safety of SHR-1314 for Psoriatic Arthritis

Inclusion Criteria: 1. The subject voluntarily signs an informed consent form before any procedures related to the research start; 2. Age ≥18 years old and ≤75 years old at the time of signing the informed consent form, regardless of gender; 3. At the time of screening, it met the 2006 psoriatic arthritis classification standard (CASPAR); 4. There is active PsA before randomization; 5. Have active plaque psoriasis (at least one plaque skin lesion) at the time of screening, or have a history of plaque psoriasis; Exclusion Criteria: 1. Existence of any of the following medical history or comorbid diseases: drug-induced psoriasis; other active inflammatory diseases or autoimmune diseases; 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.