Considering the complexity and decentralization of data acquisition and power supply for cockpit devices of flight simulator, this paper designs and realizes a distributed simulation system for aircraft cockpit based on embedded Ethernet and Power over Ethernet technology. A simulation scheme with many nodes of data acquisition and instrument control is adopted. Based on PoE technology, the power subsystem can supply DC power on the same cable that carries data. As a result, this greatly simplifies power wiring installation in the narrow cockpit while improving reliability. The design of aircraft cockpit simulation has been successfully used in certain type flight simulator. Through the actual system testing, the design has excellences of higher stability, expansibility and security.