The work aims to explore the main factors affecting the willingness to use museum APPs and compile a scale to provide guidance for the development and design optimization of such APPs. Based on the theory of technology acceptance model, three user perception factors, namely, interface visual perception, interaction experience perception and trust perception, were summarized as external variables through structured interviews. A hypothetical model for the influence mechanism of user experience was constructed. The feasibility of the measurement model was verified through exploratory factor analysis and validation factor analysis. And a scale of the willingness to use museum APPs was formed. The hypothetical model was validated and the main influencing factors of APP users' willingness to use were confirmed; The scale was used to quantitatively analyze the user experience effect of the Lin'an Museum APP and optimize the design based on the validated influencing factors of willingness to use. The scale of the museum APP users' willingness to use was compiled; The variables affecting the users' willingness to use were verified to be:perceived ease of use, perceived trust, and perceived usefulness in order of intensity; The Lin'an Museum APP was optimized through the scale analysis, and the effect was in line with the expectation. The optimization design empirically proves the validity of the scale and the assumption of the influencing factors, indicating that the technology acceptance model is highly feasible for measuring the APP users' willingness to use and analyzing the influencing factors. The scale compiled by this study has certain positive significance for the development and optimization design of museum APPs.