In view of the fixed-focus nature of imaging of the bi-electrode electrostatic focusing concentric spherical system, the image plane position and the magnification of system are immediately determined when the geometry of the system is relatively fixed; if the electrical parameters of the system are changed, the changes of the image plane position and its magnification will be extremely tiny. This paper studies the variations of the electron optical imaging characteristics and its lateral aberrations when inserting a large number of gate electrodes into the bi-electrode electrostatic focusing concentric spherical system composed of the photocathode and the anode. This paper once again confirms that for the multi-electrode electrostatic focusing concentric spherical system, the second-order paraxial lateral chromatic aberration of the imaging electronic optical system, i.e., the Recknagel-Apцимович formula, is still valid. The electron optical imaging characteristics of the tri-electrode electrostatic focusing concentric spherical system are emphatically discussed.