Abstract: To better cultivate high-quality agricultural talents, and to promote the English proficiency and learning efficiency of agricultural postgraduates, the paper conducted English proficiency placement test, questionnaires and interviews under the guidance of information service theories to analyze learner needs and levels of information literacy of postgraduates who were from the Graduate School of Chinese Academy of Agricultural Sciences. Results showed that the objective state of the user need was that the agricultural postgraduates had relative low language proficiency and great individual differences. The expressed state of the user need was that the agricultural postgraduates were in need of new information service form and content. Their information literacy needed to be improved. Although the agricultural postgraduates were aware of the importance of autonomous learning, their ability in practice was weak. The contradiction among the objective state and expressed state of user need and their information literacy provided a challenge for high quality teaching, and became the driving force for the reforms in English teaching for agricultural postgraduates. Employment of information service theories in English learning will make the real principal subject and center clear, and realize the optimal coupling of user need and information service, and the effect of language learning and teaching.