In this paper, the author introduced in detail about the geoelectric instrument in each stage of development and the development process, function, characteristics of its representative instrument. The relationship between the improvement of the earthquake geo-resistivity observation technology and the development of the geoelectric instruments which promote and interplay each other also discussed.%文章对地电仪器的各个发展阶段及其代表仪器的研制过程、功能、特点作了较详细的介绍，论述了地震地电阻率观测技术进步与地电仪器发展之间的相互促进、相互影响的关系。
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