| Based on the analysis of application and development of the prestressed steel structures and the pretressed grids especially of the world, A new structure which is gather the pretressed grids and suspended structures's characteristics and which is formed by pretressed cables and chord members ,is suggested.The new structure includes two parts: the above part and the below part. The idea of the new structure is it displaces the whole below chords of the base of the new structure and the part below chords of the above of the new structure to the flexible cables.First,The steel structure's simulation CAD which is setted in AutoCAD and empoldered according to finite element theory , cellular automata theory and the idea of simulation is introduced in detail in this paper , the new pretressed grids.can be analysed by the simulation CAD, This paper introduces the software's research background and theory method in detail also.Then,A new structure which is formed by pretressed cables and chord members ,is suggested.Using the steel structure's simulation CAD, this paper analyses the internal force and displacement of the above structure of three disposals of the base and the infection of the internal force and displacement of the above structure by the different heights of the base.This paper discusses the ascertain of the appropriate cable pre-force value and the rational gradation of bringing to bear the relative rational prestress also;At last,According to a disposal of the base of the new structure,a new former whose part below chords of the above of the new structure are replaced by cables is created and the analyse of the simulation of the new structure's construction.Through the research and analysis,It can be proved that this kind of structure is a new kind one which is composed of cables and chord members. And this kind of structure is reasonable.it's worthwhile to be researched further in the future.
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