Abstract: This article introduces the basic concepts of Keil development environment and its support for embedded development, with a focus on discussing the organization and characteristics of multi folder projects. Subsequently, a thorough analysis was conducted on the strategy of implementing multi folder project packaging in the Keil environment, including key technologies involved in the compilation and linking processes. Detailed explanation of the generation method of LIB library, including the concept of LIB library, generation process, and application examples in multi folder projects. Through practical case analysis, common problems and solutions in LIB library generation were discussed.