IntroductionChallenges in social communication and interaction are common among school-aged autistic children in mainstream society settings. Although social skills group training (SSGT) is effective in promoting positive psycho-social functioning outcomes in autistic children, there is no standardised evidence-based SSGT in Mainland China to date. Therefore, the main aim of this study is to evaluate the feasibility and acceptability of the culturally-adapted 16-session version of the KONTAKTTMprogramme in Chinese autistic children. In addition, this study will provide preliminary effectiveness and cost-effectiveness data on the 16-session Chinese version of KONTAKTTM.Methods and analysisThis is a randomised, single-blinded, wait-list controlled feasibility study with 36 autistic children aged 8–12 years with Intelligence Quotient over 70. They will be assigned to either the immediate training group (ITG) or the delayed training group (DTG) based on gender. Feasibility will be measured by the mixed-methods data of acceptability and adherence of participants, parents, and providers. Preliminary effectiveness and cost-effectiveness will be assessed by quantitative data collected at five-time points. The main outcome is the improvement in social skills as measured by the Contextual Assessment of Social Skills (CASS). Other outcomes include autism traits, adaptive functioning, self-assertiveness, psycho-social functioning, parental reflective functioning, and school support. Common process factors and their effects on outcomes will also be explored. Cost-effectiveness will consider both societal and healthcare perspectives.Ethics and disseminationThe current study protocol has been reviewed and ethics approval obtained from the Ethical Board Committee at the Third Affiliated Hospital of Sun Yat-sen University (II2023-119-01). The trial has pre-registered in Chinese Clinical Trials (ChiCTR2300072136) on 05 June 2023. The results of this trial will be actively disseminated through manuscript publications and conference presentations.Strengths and limitations of this studyComprehensive assessment via diverse outcome acquisition methods and multiple informants.Systematic cultural adaptation using the Integrative Cultural Adaptation Framework (ICAF) ensures the appropriateness of the Chinese version of KONTAKTTM.Collect data on readiness for change, providing insights into “help-seeker” effects.Limited generalisability due to a single study site, location-specific inclusion, and absence of active comparator.Uncertain psychometric properties of certain measures due to a lack of Chinese population data.