Abstract: The design and development of the distribution automation terminal based on modular configuration design mainly consists in design of the distribution terminal hardware according to different functional demands as independent hardware modules.The module can be an arbitrary combination of rail installation,and the module installation is no longer limited by the chassis size and the slot number.So the module type and quantity can be configured according to project demands.The modules communicate with each other through the fast channel preemption mechanism with collision detection,while possessing the function of plug and play.This paper mainly researches and describes the novel distribution automation terminal based on modular configuration design in terms of hardware module classification and structure design,high-speed bus interface and communication mechanism design,module adaptive access design,etc.The high-speed bus control technology,high-speed bus resource preemption technology based on collision detection,plug and play technology based on adaptive access are conspicuous.