After the implementation of SAP BPS in the enterprise,it brings trouble for budget approval due to the C/S structure. It is difficult to make managers at all levels to participate the whole budget approval. Therefore,this article studied data interface and interaction techniques between SAP BPS and workflow system,and designed the solutions of two level process for budget approval based on enterprise group. The practice on the system of comprehensive budget approval for CNR shows that the techniques and process solutions have good interactivity with SAP BPS and high efficiency.