This study addresses the user needs of online painting learning platforms by integrating constructivist education theory and the Analytic Hierarchy Process (AHP) to develop an interactive design model and strategies aimed at enhancing the learning experience and educational outcomes. The research first analyzes constructivist education theory, categorizing key learning environment elements into environment creation, conversation and collaboration, and meaning construction evaluation. A case study approach is then used to examine several exemplary online painting learning platforms, analyzing the role of constructivist elements within them. Design elements are extracted and mapped to these learning environment components, with the AHP applied to identify the key design factors. Finally, the study combines the analysis with interactive design to propose a design model and strategies for online painting education platforms. The findings highlight methods such as improving classroom context creation, enhancing guidance effectiveness, fostering collaboration and communication, optimizing the online learning atmosphere, and supporting design exposition training. The proposed design framework integrates both qualitative and quantitative analysis, offering a comprehensive approach to the innovation and development of online education products.