Facing the present status of camouflage and defence,crucial problems,existing in camouflage net,smoke screen and decoy for use as ground targets' photoelectric defence,were analyzed.Aiming high-tech reconnaissance and detection,new demands for camouflage techniques including wide area camouflage defence,moving target defence,effective evaluation for photoelectric countermeasures and soldier's camouflage clothing systems were pointed out.Some new concepts and techniques of camouflage defence,such as artificial fog without flame,IR thermal image,simulation decoy,adaptive camouflage and bionic camouflage for the ground targets,were put forward.