静电教学的演示实验不仅困难大,而且相应仪器的品种也少.与此同时,能永驻电荷的驻极体的研究已发展为近代应用物理分支学科之一,性能优异的驻极体材料相继问世.这样,研制高性能的新型静电教学仪器不仅有必要,而且有了实现的可能.本文在简介驻极体材料及其充电法的基础上,介绍一下永电针的设计和应用. The demonstration experiment of electrostatic teaching is not only difficult, but also the variety of corresponding instruments. At the same time, the study of electrets capable of permanent charge has developed into one of the branches of modern applied physics, and excellent electret materials have been successively In this way, developing a new type of high-performance electrostatic teaching instrument is not only necessary, but also has the possibility of realization. In this paper, based on the introduction of electret material and its charging method, we introduce the design and application of Yong Electron Needle.