The aggregate machine-tool is according to the work piece need, take the massive general parts as the foundation, matches one kind of highly effective special purpose machine which composes by the few special-purpose parts. It mainly uses in bank or ridge between fields the body class components and the duplicate miscellaneous items hole surface processing, its productivity is high. Because the working procedure is centralized, but multi-surface, multiposition, multiple spindle, at the same time multi-knives automatic processing. The processing precision is stable, the development cycle is short, is advantageous for the design, the manufacture and the use maintenance cost is low, therefore the universalization, the seriation, the standardized degree is high, the common parts account for 70%-80%. automaticities to be high, the labor intensity is low. Disposes nimbly, the engine bed easy to transform, when product or craft change, the general part also may generally the reuse. It in light industry profession large quantities of mass productions and so on automobile, tractor, diesel engine, war industry has obtained the widespread use, some small batch production enterprise, like manufacturing industries and so on in engine bed, locomotive, project machinery also widely uses.