rod is in the engine the high accuracy crucial element, by the continually body of rod, the connecting rod cap is composed together. In the tradition fabrication technology, the manufacture which and covers including the body of rod relies on two methods: 1) continually the body of rod and covers the whole forging -> sawing separation -> contact face machining -> assembly. 2) the body of rod - covers continually forges -> the contact face machining -> assembly separately. Uses the above two crafts, not only need the joint surface which and covers to continually the body of rod carry on the milling and the grinding, and must drill the articulation bolt index hole and the tapping hole on this joint surface, or cuts the system end surface tooth, drills the articulation localization cotter hole and drills the bolt hole and so on, so that the future can cause the body of rod - lid to realize continually puts all in one load precisely. Therefore, needs the many processing engine beds, passes through several working procedures, consumes the massive processing man-hour. in view of connecting rod tradition fabrication technology in shortcoming, to reduce the factory expense and the man-hour, increases the grade of fit, the connecting rod break cutting in half craft was proposed, first and in the 80s, applies for the patent by Alfling Corporation in Germany. After that the related research in US, Germany makes the progress unceasingly. Since the 90s, this craft enters the practical application production base in the industrially advanced country. The suitable semifinished materials from the initial powder forging connecting rod, developed the high-carbon steel forging connecting rod, the use factory have covered the US three big Car companies, as well as Germany ran quickly, the BMW and so on famous enterprise. At present the domestic application this technology's factory is the FAW Populace Engine plant, introduces Germany technical equip, is suitable in each cylinder 5 bad attitudes gate new engine connecting rod.