As the brain of intelligent satellites, the on-board integrated electronic system is the core system in the overall design of smart satellites. Based on modular integrated electronic technology, this paper innovatively adopts system engineering methods to uniformly design the information processing, control and management procedures, hardware and software equipment of intelligent satellites to realize the sharing of information resource and the optimization of the entire satellite system, which takes the lead in the research area of intelligent satellites in China. The research content mainly includes hardware architecture design and software network architecture design of intelligence satellites. In terms of hardware architecture, creative ideas of modular and open structure design are adopted, and standardized interfaces are designed for on-board hardware, realizing efficient integration and plug-and-play of satellite hardware. As for the software network architecture, the hierarchical design is inventively adopted to facilitate the reuse of software resources; through the unified deployment of on-board computing resources, the ability of autonomous management of tasks and the autonomous processing of data is improved to facilitate rapid application. The overall ingenious design has the characteristics of openness, versatility and flexibility, and meets the application requirements of intelligent satellites.