A system for auto building processing tables is presented to meet the need of the application of CAPP in enterprises.An universal model is built to deal with the processing tables,which takes the processing table of an enterprise as an instance and accordingly takes its types and requirements etc.as the properties of the above instance.The system adopts ODBC technology in order to offer an interface to interchange data among different systems such as MIS,PDM.It is proved that the system is of originality universality and practicability.