中文摘要：

低温超导技术在基础科学研究中的广泛应用,极大地带动了低温工程的发展。大型强子对撞机（LHC）、国际热核聚变实验堆（ITER）、先进实验超导托卡马克（EAST）、北京正负电子对撞机重大改造项目（BEPC-II）所配套的大型氦低温系统,分别作为国际与国内最大的低温装置,代表了当今低温技术的最高水平。介绍了这4个典型低温系统的流程、性能指标以及运行情况,以及其它具有代表性的氦低温系统及其应用。

英文摘要：

While the applications of low temperature superconducting technology in basic scientific research spread widely,the development of cryogenic engineering was greatly accelerated,and lots of large helium cryogenic systems were established successively. As the largest cryogenic devices in China,the helium cryogenic systems of the Experimental Advanced Superconducting Tokamak（ EAST） and the Beijing Electron Positron Collider Upgrade Project（ BEPC-II） represent the current highest level of cryogenic technology of China. And the largest international cryogenic devices,the helium cryogenic systems of the Large Hadron Collider（ LHC） and the International Thermonuclear Experimental Reactor（ ITER） show the highest level of the world. The processes,performances and operating conditions of these four typical cryogenic systems were described in detail. And some other representative helium cryogenic systems were introduced,too.