The work aims to explore the relevant interface design strategies of flow experience in the pre-stage from the perspective of PAT model. Based on the PAT model, the research results of the existing flow experience in the field of Internet products in the pre-stage were classified and analyzed from the three levels of users, tools and tasks, and the specific antecedent factors were summarized. Through literature research, induction and case analysis, the corresponding interface design strategies were proposed for different antecedent factors. The interface design strategies for user level included:inclusive multi-level user positioning, effective focus time interval setting, guiding interactive function setting, interesting perception information prompting; interface design strategies for tool level included:clear interface layout, perceptible operation clues, personalized customized content, concise operation service process, immersive social interaction elements; and the interface strategies for task level included:adjustable dynamic balance of difficulty, segmented task goal setting, diversified reward incentive mechanism and timely effective feedback mechanism. The research results further deepen the strategy research of flow theory in the field of interface design.