Based on the inheritance of calligraphy modernization and the empirical research on the calligraphy mobile application platform based on the immersion theory, the paper explores the laws of users’ emotional experience when using calligraphy mobile applications to study scientific design strategies. In-depth interview for 16 participants who have flow experience was conducted to extract the impact indicators of the users to achieve the flow experience. The impact indicators were encoded based on the flow theory to produce the initial questionnaire. After its pre-test, a large-scale formal questionnaire survey was conducted and the structural equation model was constructed and analyzed. The results show that the questionnaire can effectively measure whether the users of the calligraphy mobile application platform reach the flow experience, and the explicit and clear goal is the key dimension that affects the user satisfaction. At the same time, timely and valuable feedback, skill matching and task challenge also have a significant positive impact on user satisfaction. Based on this conclusion, the method to improve user flow experience, and the design strategy of the calligraphy mobile application platform proposed provide guidance for future practice and research.