On the basis of analysis of the technical specifications of the 320x240 long wavelength infrared uncooled microbolometer detector developed by ULIS Corporation of France,the necessity of temperature controlling for microbolometer uncooled focal plane arrays thermal camera is discussed,and the essential aspect of design of temperature controlling is presented.The merits of temperature controlling schematic by single chip microcomputer, liner mode monolithic thermoelectric cooler controller and switch mode monolithic thermoelectric cooler controller are discussed.A appropriate temperature controlling circuit for the 320×240 long wavelength infrared CMOS uncooled integrated microbolometer detector is developed by a single chip monolithic thermoelectric cooller controller, named ADN8830, produced by Analog Devices Inc.,and the temperature controlling circuit can keep the temperature change of the uncooled focal plane array detector in 30±0.01 ℃ so that the uncooled focal plane array detector work in the range of the most optimized temperature. This is a better scheme of temperature controlling for its high efficiency, low power and compact size.