Abstract: A NEW AUTOMATIC FIXED PEAK TECHNOLOGY OF MICROCONTROLLERHuang Liguo Wang Dequan Zhang Damin Li JunLiu Yuwen Guo Qingxue Wang Guifeng(Dalian Applied Technique Institute of Nuclear Industry,116032)Abstract The microcontroller automatic fixed peak technology which differs from fashion half channel fixed peak is described. It bases on the principles of selecting double single channel and readjusting the voltage of power source. This technology is suitable to the industrial isotope instruments with various radioactive sources.Key words automatic fixed peak microcontroller scintillation detector