From small scale to medium and large scale 320×240, 640×480 uncooled focal plane array (UFPA), uncooled infrared technology has been developed rapidly in recent years, and 1024×1024 FPAs are expected in the future. The pixel pitch is also developed from 50～25 μm, and the sensitivity is improved largely, so that the thermal imaging system is applied successfully in military affairs. Part model has been armed in military and measured well. In the future, with the developing larger scale and smaller pixel of UFPA, the application of uncooled thermal imaging system will be wider, especially in light thermal weapon,such as light weapon vision, driver vision enhancer and handle thermal system, uncooled thermal imaging system is expected to replace the high price, low reliability, big bulk cooled thermal imaging system gradually in recent years.