Abstract: The research on gas deflagration flame quenching is the basis of explosion-proof and explosion suppression technology. Large eddy simulation (LES) coupled with Finite Rate/EDM was used for three-dimensional simulation on the quenching process of methane air premixed flame in the Flame-Resistant element of crimped ribbon flame arrester in order to suppress gas deflagration effectively and reveal the rule of gas deflagration flame development in the micro channel. Based on the transient characteristics of temperature and reaction rate, the mechanism of flame quenching and the effects of inlet flame velocity and wall temperature were analyzed. It has been found that the flame propagation is mainly affected by the entrance flame and the internal combustion reaction. The flame velocity and internal combustion reaction rate decrease with the development of flame. At the later stage, the influence of internal combustion reaction on flame propagation is dominant. The wall of flame arrester has an important effect on the reaction rate. Reducing the combustion reaction area is conducive to the quenching of flame. There is a positive feedback relationship between flame velocity and combustion chemical reaction rate. The quenching distance will extend with the increase of inlet flame velocity, and the growth rate will slow down. The change of wall temperature has little effect on the chemical reaction rate. Increasing wall temperature will hinder the wall heat dissipation and extend the quenching distance. The growth rate of quenching distance will be enhanced with the increase of inlet flame velocity. The flame will pass through the flame arrester when the wall temperature is high enough, resulting in the failure of the flame arrester.