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Crystallite size is closely related to CH4 sensitivity for SnO2 sensors. The crystallite size is growing during heat treatments such as calcinations and sintering. To develop highly sensitive methane gas sensors some dopants as crystallite growth inhibitors are added to SnO2 powder. This paper is mainly concerned with effect of heat treatment of SnO2 doped with various grain growth inhibitors on CH4 sensitivity. We fabricated thick film methane gas sensors using SnO2 powders doped with K, Ca, and Mg. There is the optimum sintering temperature and time. Sensitivity is more affected by temperature than by time. And the sensitivity is exactly the same order as crystallite size.