Abstract: An internal lighting system for aircraft passenger cabin is designed．According to task needs，proper type of light source is chosen and the lighting characteristics of light source are designed．A dome light for common lighting and a reading light for accent lighting are developed．The principle of calculating illuminance using radiosity algorithm is elaborated．Based on the light number minimization rule，a simulation procedure is designed．Configuration of lights is determined via simulation on DIALux．The results of simulation and experiment are compared and analyzed，the feasibility of the lighting system is thus justified．