The work aims to design and study the family rehabilitation products based on the two psychological theories of "safe attachment" and "immersion theory" and establish the evaluation model of the most suitable design scheme in order to help autistic children in rehabilitation training in the family scene and improve their rehabilitation effect. With Guangzhou Little Angel Rehabilitation Training Center as the research object, qualitative indicators were determined through user research methods such as literature review, natural observation, questionnaire and interview, and the Gephi APP was used to conduct cluster analysis on the theoretical construction of "safe attachment" and "immersion theory". The three methods of AHP, GRA and TOPSIS were comprehensively applied to fully utilize their respective superiority and avoid limitations, so as to establish the design guidance and evaluation model of family intervention products for autistic children and conduct in-depth design. The design guidance and quantitative evaluation model of "family rehabilitation product design for autistic children" was established based on the improvement of four aspects of autistic children including social interaction disorder, emotional disorder, cognitive disorder and sensory disorder. The model was applied to the design practice and the evaluation of the best scheme. The design strategy and evaluation method of family rehabilitation products for autistic children based on "safe attachment" and "immersion theory" are scientific in evaluation process and reasonable in results. Through design practice, a scientific and effective immersive intervention experience is created to promote autistic children to build a safe attachment relationship, and improve the effect of rehabilitation training for autistic children.