Abstract: To show the advantages and prospects of LED applicated in the field of aviation ,we introduced the LED light source used in aircraft navigation lights, which has the merit of small volume, light weight, easy design and maintenance, etc, and elaborated on the requirements of high security, high reliability and high optical quality for applying LED in aircraft navigation lights . Through the analysis on the optical distribution demands of navigation lights, we designed an optical lens which was consisting of total internal reflect (TIR) system and prism system according to the selected LED source. The optical simulation result shows that, the center optical intensity is more than 40 cd when the power consuming is less than 1W , indicating the LED navigation lamp has good optical performance.