Abstract: The general framework and function of process data analysis system are introduced by integrating theories of data warehouse(DW) and statistical process control(SPC) with characteristics of the production process in iron & steel enterprise.And then an example of selecting relative parameters in process data analysis is given.Lastly the process of performance parameters prediction by improved support vector machine(SVM) and the process of generating rules set by rough set are explained in detail.Experiments show that the generated prediction model and rules can support enterprise's decision and meet enterprise's requirement.