In current civil aircrafts many cables are used in cabin lighting system which may result in too heavy weight and make it difficult for trouble-shooting and maintenance.To solve the problem dual-channel ARINC825 digital bus architecture was designed for the cabin lighting system of civil aircrafts. The rewired architecture was compared with the original hardwire architecture and the result showed that the architecture based on ARINC825 digital bus can greatly optimize the cabin lighting system.