Reasonable benefit distribution is an important guarantee to motivate the catechism alliance platform and universities to jointly promote the construction of high-quality digital education resources. Taking Ningbo University Catechism Alliance Platform as an example, firstly, the Shapley value improvement model is applied to design the benefit distribution mechanism between universities in terms of the quantity and quality of catechism courses. Secondly, considering the platform as an "economist", the Shapley value improvement model is incorporated into the principal-agent model between the platform and universities, and the bonus distribution mechanism between the platform and universities is designed. It is found that this mechanism is conducive to motivating universities to build high-quality digital education resources, expanding the quantitative scale of the catechism alliance and improving the effectiveness of the platform.