The change of unsaturated fats and subsidiaries into powers and other helpful synthetics is developing inspired by ongoing years. Ketonic decarboxylation is quite possibly the most response to change over carboxylic acids or carboxylic esters into ketones, carbon diox-ide, and water. For the most part, the ketonic decarboxylation of unsaturated fats is done in the gas stage at high temperatures from 400 to 550 °C at barometrical pressing factor. In any case, the break ing response typically happens as the side response that subsequent to diminish the selectivity and limit the yield of the ideal ketone item. Methyl stearate (C18:0) is one of the key unsaturated fat methyl ester (FAME) part of biodiesel fuel and it turns out to be more consideration in Thailand as another option and re-newable diesel fuel. Consequently, Methyl stearate was chosen as a substrate for ketonic decarboxylation. Additionally, different factors like temperature, pressure, causticity, and so forth were report-ed as the impacts which advance synergist breaking side response during ketonic decarboxylation. Consequently, this work is engaged to research the ideal condition that stifled the feline alytic breaking of methyl stearate.