In previous paper, the author examined the relation between the removal velocity of combustion zone and the size of coal particles in coal seam model. In this paper, the author examined also the removal velocity of combustion zone as the function of quantity of oxygen gas which are feeded in canal, diameter of canal, and dencity of coal particles. When we plan to gasify the coal seam in practice, we must previously determine the diameter of canals which are bored in coal seam.The results which are reveald in this paper show us these parameters clearlly. Moreover, we can control the removal velocity of combustion zone successfully according to these results, which are obtained in this paper mathematically and experimentally.