Child abuse is a public health problem that received wide attention globally and locally.  The 5-year-old Lam Lam's death deal to physical abuse by her parents in Jan 2018 and the recent child abuse incident in a children's hostel operated by the Hong Kong Society for the protection of children have aroused public concern about child abuse incidents in Hong Kong.  The death of Lam Lam in 2018 created a background for the social welfare department to start a pilot scheme of social work service in pre-primary institutions aiming at child protection and this pilot scheme will be regularized from 2022 onwards.  An ecological framework of understanding child physical abuse indicated the interactions at individual, family, community, and societal levels contributed to child physical abuse.  Etiology studies identified child abuse risk factors including adverse life events, parents' mental health problems, and attitudes toward harsh and corporal punishment.  Also, parents may have high parenting stress in parenting a child with special educational needs, and difficult to comply with parents' instructions.  Usually, these parents are hard to reach and have low motivation to receive services because of social isolation, lower self-esteem, and lower parenting confidence.  Parenting programs that aimed at enhancing parents' knowledge of children's development, ways to establish positive parent-child interaction, and positive parenting and problem-solving skills were found effective in reducing child abuse risk factors.  Nevertheless, there is a lack of parenting program that aimed at prevention of child abuse in Hong Kong and parenting programs usually participated by self-motivated parents.  Online programs were found effective in engaging parents with low motivation to join a parenting program.  The present proposed study is to compare a face-to-face and on-line parenting program for parents with children aged 3-8.  This is the age group with the highest percentage of reported child abuse cases in Hong Kong.  This preventive parenting program is adapted from well researched effective parenting program "the incredible years" with locally researched effective components of parenting program.  Program contents includes knowledge of children's development, risk factors of child physical abuse and neglect, positive parenting skills, children' behavior management skills as well as stress-releasing skills.  It will launch at a community level to reduce stigmatization with children and youth services agencies' collaboration.   The study will use a randomized controlled design with 330 parents of 3–8-year-old children and randomized into three conditions: Face to face (FTF), online (OL), and waiting list control (WL) condition.  Assessment of participants' parenting styles, depression, and anxiety levels, parenting stress levels, children's emotional and behavioral symptoms together with their views about the program will be conducted.  Multilevel analyses, including mediators and moderators, will enable us to examine which intervention is more or less effective as well as what intervention works for whom.    This research will provide the much-needed evidence to show whether a child abuse prevention parenting program is effective when delivered in FTF or an online format and whether outcomes are similar or different to parents and children's characteristics.  In establishing this evidence, we will be able to provide professionals and services with a wider selection of delivery methods of a parenting program, enabling greater reach of this program to families and effectiveness of child abuse prevention parenting programs.