Multi-Dose Study of SHR-1314 in Subjects With Moderate-to-severe Plaque Psoriasis

This study is a multiple dose escalating design to evaluate the safety, PK, and pharmacodynamics (PD) of multiple subcutaneous injections of SHR-1314. There are two parts in this study. The safety, PK, and PD will be evaluated in Part A, the dose escalation part. The efficacy and safety on different doses will be assessed in parallel-groups in Part B.