The category of audio-visual dysfunction represents the largest group of children with delayed language development. Audio-visual dysfunction not only affects children's normal communication but also hinders their growth, becoming the main reason affecting their life and learning. In China, medical resources for children with audio-visual dysfunction are noticeably insufficient and cannot be valued. The rehabilitation exercise cycle is long, and patients and their parents are mostly unable to adhere to it in the long-term. Aiming at addressing these problems, this paper tries to design and study the family treatment system of audio-visual dysfunction independently. Users with experience design users for zhongtun, jizuatun and li, experience full link, pay attention to the details of each experience point, strive to accurately complete each treatment training in the most efficient display space and play the training function of the acme. Behind the emotional expression, a good design with common characteristics of user experience is made through the front iteration process of user model establishment and data accumulation. The research content of this paper is structured as follows: first, it studies the principle of user experience, analyses the influence of mobile devices on pre-school children and discusses the characteristics of existing children's educational toys and children's interactive products, as well as the physical and intellectual characteristics of pre-school children. Then, the classification, causes and treatment of children's visual and audio impairment are discussed. The design method of combining the theoretical movement of user experience with children's audio-visual functional family therapy system is mentioned. Then, more effective user requirements were collected through observation of target user behaviour, single interview and exploration of storage and modelling. We also summarise user requirements, build user models in story form and prioritise requirements.