Study of Efficacy and Safety of HB0017 in Patients With Moderate to Severe Plaque Psoriasis

Who May Qualify: - Male or female subjects aged 18-75 years (inclusive) - Chronic plaque psoriasis (PSO) for at least 6 months prior to the Randomization. - Psoriasis Area Severity Index (PASI) \>=12 and body surface area (BSA) affected by PSO \>=10% and Static Physician Global Assessment (sPGA) score \>=3. - Subjects who are suitable for systemic treatment or phototherapy for psoriasis as judged by the investigator - Subjects who are able to use effective contraception from the screening period to 6 months after the last dose Key Who Should NOT Join This Trial: - Forms of psoriasis other than chronic plaque-type (e.g., pustular, erythrodermic and/or guttate psoriasis) at screening or baseline - Drug-induced psoriasis - Ongoing use of prohibited treatments - Any active infection (other than common cold) within 14 days - Serious infection defined as requiring hospitalization or iv anti-infective(s) within 1 month prior to randomization - Have previously received any drug that directly targets IL-17 or IL-17 receptor - Have concurrent or recent use of any biologic agent within the following waiting period after previous treatments: etanercept \<28 days; infliximab and adalimumab \<60 days; golimumab \< 90 days; anti-IL-12/anti-IL-23 or anti-IL-23p19 antibody drugs \<6 months; or other anti-psoriatic therapy not listed herein within its 5 half-lives prior to randomization - A history of inflammatory bowel disease or other serious autoimmune conditions (where your immune system attacks your own body) - Previously diagnosed with serious mental illness such as anxiety, depression or suicidal tendency Always talk to your doctor about whether this trial is right for you.