According to the energy consumption status and roof insulation technical characteristics of rural housing in severe cold region,a double-layer composite roof insulation model for roof insulation and energysaving is proposed,which adapts to the contemporary rural housing roof features.The design of the model is described;a mathematical model of heat balance of the enclosed space under the ceiling of the pattern is set up,and the thickness of different reference insulation materials is given.The model proposed is a new design for rural housing roof insulation and energy-saving in severe cold region.