Library is an irreplaceable part of the public cultural service system. Nowadays, the informatization of library reservation management is the general trend. Many university libraries and social public libraries have begun to introduce management systems such as library reservation systems, in order to save manpower and material resources while improving the efficiency of the library. This system is developed using C# language, adopts B/S structure, Asp.Net Core MVC web application framework for development, uses SQL Server as the database, and applies microservice architecture. The system realizes the reasonable allocation of library space resources, saves users' time, and makes the library's reservation management more efficient and convenient.