Abstract: The simulating measure of electrostatic field is an important basic experiment, but the present in- strument is difficult to meet the measure demand, leads to a large error of experiment result, We present a development for instrument, which has large measure squareness flume, lever regulate nut, and rail under-draught electrode structural etc. It has been shown that the instrument can improve accuracy of determination measurement, add experiment content, and easy to operation.

Key words: simulating measure of electrostatic field, rail under-draught electrode, lever regulate