1. A method of forming composite images comprising: a first step of charging and simultaneously exposing a composite photoresponsive member having a electroconductive base, a photoconductive layer and an insulation layer to a negative image; a second step of irradiating said photoresponsive member with light, a third step of charging said photoresponsive member with an alternating-current charging means to reduce the surface potential charged in the first step to approximately zero; a fourth step of exposing said photoresponsive member to a positive image thereby forming a composite electrostatic latent image; and a fifth step of developing said composite electrostatic latent image.