This document discusses the development of a computer-assisted instruction (CAI) model for vocational high schools. It begins by outlining challenges in modern learning related to changing perceptions of learning and advances in information technology. The document then reviews relevant learning theories that can support CAI development, including behaviorism, cognitivism, constructivism, and Vygotsky's zone of proximal development. It also discusses different CAI models and approaches to developing instructional media. The goal of the study is to systematically develop a valid, practical and consistent CAI model for vocational high schools that integrates multiple teaching methods and constructivist learning theory.