A business process management（BPM） platform based on service architecture is designed. By analyzing the requirement of process integration and intensive management between different applications and process closed-loop management in electric power industry， an overall framework of distributed BPM platform is proposed for power enterprises. It includes the business process designer， process client application， process engine， management console and process statistic analysis， etc. The process intercourse is explained as an example of the two-level approval process. Based on BPMN2.0 standard， this platform provides business-oriented process integration and intensive management， fully supporting the life-cycle management of the business process.