The construction and calculation results of a hyperboloidal field of unipotential electrostatic lens with low spherical aberration is presented, by which the performance of the electron optical system of the field emission gun can be easily improved. 本文给出一种双曲场单电位低球差场发射枪静电透镜的结构及计算结果,它将有助于改进和提高场发射枪的电子光学性能。