Purpose: This study examined the feasibility, acceptability, and preliminary effectiveness of Parenting for Lifelong Health for Parents and Adolescents program in reducing the risk of child maltreatment in Chinese families with adolescents. Methods: A pre-post single-arm pilot trial was conducted in July and August, 2023, and involved 16 parents and 13 teenagers with a mixed-methods design to collect both quantitative and qualitative data. Results: Parents reported enhanced positive parenting and reduced child behavioral problems. Adolescents reported decreased general child maltreatment and emotional maltreatment, along with perceived improvements in positive parenting and parent-child communication. Thematic analyses suggested of tangible benefits for participants, as well as for their family dynamics. Discussion: The program demonstrated promising feasibility, and it was significantly associated with reduced adolescent maltreatment. Further rigorous randomized controlled trials are needed.