The developing area can carry out technology catching-up through the lagging effect,but the key to technology catching-up is to have technological ability,which is under the existing technology gap,the developing area must have some degree of learning ability and social ability to realize the technology catching-up.Based on Verspagen's model of the technology catching-up,this paper analyzes the relation among the technological gap,technology ability and technology catching-up.The conclusion is that the deducing of technological gap and the realization of technological catching-up all depend on technological ability such as the learning ability and social ability.For the developing area,promoting one's own technological ability through the cultivation of the learning ability and social ability can realize technology catching-up and economic catching-up.Thus the developing area should cultivate the learning ability and social ability to cultivate the special area innovation system and the innovation ability,and work for deducing the technological gap to realize the technology catching-up.