The transformation process and effect of the five heating methods used in the two powder spraying production lines are described.The cost of electrical energy and diesel oil was about 1.4 yuan/m^(2) before,now is about 0.35 yuan/m^(2) by using pipeline gas.Some consider and solutions were put forward on the safety involved in the transformation process,the design of baking equipment in painting production line,and the environmental protection of coating heating mode.