This paper analyzes the producer service's effect on manufacturing competitiveness by using econometric method based on input-output tables of 15 developed countries. This method made us find out the experiences shared by the developed countries.The basic results is that producer service has come to be another important factor and the major drive to enhance the manufacturing competitiveness in some manufacturings.we have taken deeper research on the different impacts of some manufacturings by various producer services.Finance and insurance has played the most important role in promoting competitiveness of textile industry and motor industry，while business service has been the greastest push for computer industry.