[Purpose/significance] This paper analyzes the characteristics of the dissipative structure of the academic library subject service system，and discusses the strategy of strengthening the system dynamic equilibrium. [Method/process] According to the dissipative structure theory, the paper put forward several new ideas and methods to manage the subject service system and its knowledge integration. [Result/conclusion] Through the analysis and research on the dissipative structure and characteristics of the subject service system, it can effectively guide the subject service work and promote its service development and service innovation.