Abstract: The evaluation of aircraft reconnaissance system was executed by wild test and laboratory test. We created the visible light target in laboratory, then put it on an two-dimensional turntable to simulate a long-distance target, utilizing halogen lamp, US army target source and optical system. The optical system of visible light target source was designed to meet the required technical indicators. The light beam angle was calculated and the diaphragm hole was designed on the foundation of light path design and temperature field analysis. The temperature variation-s impact on optical lens was analyzed to verify the reliability of the optical design. Results show that the testing requirement of aircraft reconnaissance system could be met.