Custom printing job descriptive model was designed based on the design thought of "resource link process" in JDF model using existing function modules. The printing workflow software platform based on the new model was developed, and the application of the model was tested. XML was used in the model. Compared to JDF model, the logical structure of the custom printing job descriptive model is simple. It can not only meet the need of function customization of enterprise production process, but also reduce development costs of printing workflow software platform greatly.