As national electricity market reform and development, and enterprise information integration process, the early electricity transaction and operation system is very difficult to adapt to new requirements. This paper presents a technical architecture based on SOA design model of power trading system using SCA\SDO programming model and web service to build electricity trading operation system. It solves the system reusability and the flexibility issue, at the same time integrates power transactions operating system to other enterprise production systems. It proposes a valid solution for enterprise application integration in the heterogeneous environment at the technical level.