and the inner relations among them are analyzed to reveal the research hotspots of the doctoral dissertations in Library Science abroad,so to provide reference for the research of Library Science in China.KeywordsLibrary Science  光纤同轴电缆混合网

live-and-let-live  和平共存的

ZK-live load (CRS (PDL) live load)  ZK活载

Agricultural science and technology Development law of agricultural science and technology  受精竞争：花粉管竞争

animal husbandry and veterinary science and aquatic science  畜牧兽医与水产学科

basic disciplines of information science and system science  信息科学与系统科学基础学科

Basic Disciplines of Information Science and Systems Science  信息科学与系统科学基础学科

basic science, applied science  生命周期评价; 生命周期评价(LCA); 生命价值评价(LCA)

BSCS Bachelor of Science in Computer Science  计算机科学学士

Huazhong University of Science and Technology School of Environmental Science and Engineering  华中科技大学环境科学与工程学院

Journal of Huazhong University of Science and Technology·Urban Science  土木工程与管理学报

noetic science cognitive science  思维科学认知科学

Popular science and science research  科普科研

School of Environmental Science and Engineering Dalian Science and Technology University  大连理工大学环境科学与工程学院

Science & Culture Science-Tech Waves  科技潮

Science of Law - Journal of Northwest University of Political Science and Law  法律科学－西北政法学院学报

Science of science  科学学

Science of Science and Management of S&T  科学学与科学技术管理

Shandong University of Science and Technology Survey Science and Technology College  山东科技大学测绘科学与工程学院

Studies in Science of Science  科学学研究