The light intensity distribution of warning light for the temporary closure of airport runway is critical to the guide of aircraft. In view of the effects of configuration, layout, and other factors of warning lights, one algorithm for calculating the whole luminous distribution of warning light is proposed based on the light intensity distribution model of single lamp. The experimental results indicate that the fitting degree between light intensity distribution obtained by this method and that from the practical measurement is larger than 98%, and the accuracy here is improved by more than 6% compared and with that from the superposition method of single lamp.