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Recently, energy conversion system has been proposed the use of a hydrogen which is a typical low carbon and eco-friendly energy. The hydrogen energy have demerits for storage and movement because hydrogen gas have a big diffusion characteristic, even if hydrogen energy is a eco-friendly energy. Therefore, hydrogen leakage sensing system is necessarily applied and required for high sensing performance. In this study, we conducted to determine the design parameters for the micro chip hydrogen sensor with optimized sensing conditions under the thermal characteristics. The thermal characteristics on input voltage variation was studied for correlation analysis of current, consumption power and heater temperature according to the input voltage variation from 1.0 voltage to 10.0 voltage every 0.5 voltage. The heater resistance was higher, the heat generation temperature was lower. The heat generation temperature depended on current.