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The connecting rod is one of the main components of the internal combustion engine. Its size and shape error of the first two holes have many requirements, such as: diameter, roundness, cylindricity, center distance, parallelism, verticality of the hole and the end face. Wait. How to detect these error items in the workshop production site has always been a difficult problem in the internal combustion engine industry. In the production of connecting rods, there are mainly the following detection methods in China: (1) Measuring with a mandrel, that is, putting a mandrel in the two holes of the connecting rod, and measuring by means of a V-shaped block, a flat plate, and a dial gauge. Because the mandrel needs to be loaded and unloaded, there is a gap between the hole axes, and the measurement accuracy is very low.