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.

32 m2;north and south stands the upper half of the parallel chord truss glass houses face Lasso point system,with an area of approximately 5541.

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.