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A new energy-saving composite wall structure is a new residential building structure characterized by waste utilization，savingenergy，environmental protection and good aseismic performance，which is mainly constructed with pre-cast multi-ribbed composite slabs,concealed frame and floor by means of assembling and casting. Based on the previous test of the wall，heat transfer and thermal-insulatingmechanism of the exterior slab are studied; local thermal bridge disposal and integral thermal-insulating disposal of the exterior slab are putforward and finally the practical design of the structure are discussed.shell element GST18 with three nodes and eighteen degrees offreedom is constructed.