The three experimental sketches were made to measure the flammability point according to the physical and chemical characteristics of Mg and Mg alloy by the conventional methods of measuring the flammable solid material’s flammability point. Moreover

the results were analyzed. It was preliminarily defined the possible temperature region of the Mg and Mg alloy’s flammability point exists under certain grain size and temperature raising condition

so do the influence of the grain size and temperature raising condition on the flammability point.