Abstract: Honing equipment for car engine cylinder hole is the common processing of porous cylinder equipment, usually with four honing shafts synchronous processing function, according to the honing process, usually four honing shafts are divided into two groups, respectively, to complete the rough honing and fine honing processing. In order to improve the processing efficiency, one workpiece can be processed synchronously with two axles or different workpieces can be processed in turn. According to the domestic car manufacturers used CNC honing automatic production line research, combined with the actual honing process, step process can achieve the maximum processing efficiency. It has been successfully applied in developing intelligent honing equipment for car engine cylinder hole