The paper introduced Bradfords Law and its measurement model, then used it to measure the core press of agricultural literatures in library of Xichang University, and concluded that the core presses, mainly^ included China Agriculture Press, Jindun Publishing house, Chemical Industry Press and China Forestry Publishing House. As found out from the core agricultural literatures acquisition in library of Xichang U-niversity, the acquisition in 2011 was restricted to core press only, the acquisition from other ten important agricultural presses should be improved.%介绍了布拉德福定律及测算模型构造,并对西昌学院图书馆农学(S)类文献核心出版社进行了测算,得到核心出版社为:中国农业出版社、金盾出版社、化学工业出版社、中国林业出版社.对西昌学院图书馆农学类核心文献采访发现,2011年的农学类图书采访仅限为核心出版社,应增加对布氏重要点区域的10家农学类重点出版社的采访.
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