中文摘要：

大骨节病、克山病、地方性氟中毒和地方性砷中毒是我国的主要地方病，其病因、发病机制均与宏量元素和微量元素的缺乏、中毒与失衡有关。低硒是大骨节病和克山病的重要环境因素，补硒对其具有一定防治效果。综述了微量元素硒与大骨节病和克山病之间的关系，以及硒元素在大骨节病、克山病、氟中毒和硒中毒中的作用机制方面的研究进展，旨在进一步探索微量元素硒的生物学潜能及其分子机制，更好地造福于人类。

英文摘要：

The main endemic diseases in our country include Kashin-beck disease, Keshan disease, endemic fluorosis and arseniasis. Their etiology and pathogenesis refer to the deficiency, toxicity and imbalance of macroelement and mieroelement. The selenium （Se） deficiency is the important environmental factor for Kashin-beck disease and Keshan disease, and Se supplement has good effects of prevention and treatment on Kashin-beck disease and Keshan disease. This article summarized the progress on relationship between Se and Kashin-beck disease and Keshan disease, and the action mechanism of Se in Kashin-beck disease, Keshan disease, endemic fluorosis and arseniasis. The paper was aimed to explore the potential biological functions and molecular mechanisms of Se, which was expected to bring benefits to mankind preferably.