At present , the heat preservation structure with equal thickness is widely used in industrial pipeline .The testing data from spot test of heat preservation structure with equal thickness for a certain pipeline were analyzed by means of Fluent software .Through analyzing testing data , the temperature of pipeline surface shows a distribution rule that the temperature of to p pipe is high and that of the bottom pipe is low .Thus, the design of heat preservation structure with equal thickness is reasonless.The temperature rule of pipeline outer surface was studied respectively under the conditions of both wind and non -wind.According to the heat exchange method of network , taking minimal thermal losses and maximal economical benefits as an optimized objective , an optimized design model of heat preservation structure for pipeline was set up .Moreover , a new design method of heat preservation structure with non-equal thickness is brought forward .The results show that comparing with heat preservation structure with equal thickness, under the condition of same medium inside pipelines and permitted thermal loss , that the heat preservation structure with non -equal thickness is adopted makes volumes of heat preservation materials being decreased by 3%～ 4%.At the same time , the cost of heat preservation material is cut down 3%～ 4 %.