The present experimental device for surveying and mapping the electrostatic field by simulation method commonly uses conductive paper or conductive glass as conductive medium.The uneven distribution of the medium often affects the accuracy of experi-mental results and the probe is easy to wear medium surface to cause damage.Changing the probe position manually to determine the isopotential point is cumbersome and inaccurate.In order to overcome the disadvantages of the existing experimental device,an im-proved experimental device has been put forward.The device adopts sodium chloride solution with certain concentration as conductive medium to avoid conductivity fluctuations.The device uses the controller to drive the stepper motor and linear motor to move probe ac-curately and conveniently.%目前模拟法测绘静电场的实验装置多采用导电纸或导电玻璃作为导电介质，存在因介质分布不均匀而影响实验结果准确性的情况，而且探头容易磨损介质表面，对仪器造成损伤。采用手动方式改变探针位置寻找等位点，操作繁琐，定位精度不高。为了克服现有实验装置的上述不足，提出一种改进的实验装置，该装置采用一定浓度的氯化钠溶液作为导电介质，避免导电率的波动，利用控制器控制驱动器，带动步进电机及直线电机移动探针，定位准确，操作方便。
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