Personalized information service is the inevitable trend of the existence and development of libraries in agricultural scientific research institutes. It has become the main mode of the special service of libraries in agricultural scientific research institutes. The personalized service of libraries is developing in the direction of initiative and diversity. This paper expounds the understanding of personalized information service for libraries of agricultural scientific research institutes, which taking the library of Jilin Academy of Agricultural Sciences as an example, analyzes the present situation and necessity of personalized information service in agricultural libraries. This paper puts forward the measures taken to carry out personalized information service, so as to adapt to the requirements of the rapid development of information today. The library can be more specific, accurate, effectively to carry out personalized information services, and to better serve the agricultural research and production in Jilin Province.