Mobile phone library is also called “mobile library”. It is a new way of library information service that people can query and access library information resources by using mobile devices, such as mobile phones, without limitation of time and space. ASP.NET Core open source, cross platform technology is a new breakthrough and innovation of ASP.NET, especially worthy of our study. This paper studies the characteristics and needs of private university libraries. According to its characteristics and needs, the function and design of mobile library management system are deeply studied, so as to apply ASP.NET technology to design and develop private university library management system and it can provide high-quality document information service for teaching and scientific research, and meet the information needs of teachers and students.