This paper introduces the structural system of the glass roof of the Hippo House at the Berlin Zoo, es- pecially the model selection, the formation of transition area and the structural lay-out of visitors area.

On the basis of discussions on the energy-saving designs of the flat roof,sloping roof,roof greening,storage roof and controllable glass roof,this paper analyses some relevant problems of roof energy saving,so as to attain further the purpose of energy-saving building on the promise of artistic modeling.