| This paper discusses some identifing methods for complicated quasi-variable systems.Asimple case which has only one self-internal-force mode,can be easily identified by usingcomputer procedure,Then we introduce iterative method to identify a complicated systembased on product-force. Finally,a self-internal-force mode method,which is divided threesteps, is proposed to analyse a more complicated system,The method results are more sim-ple than iterative method.So far,for any structural system,its geometrical constructionproperties can be identified by the results of this paper,The study results are useful to re-serch modern prestressed structure systems. |