How to construct I-O multiplier model so as to compute structural multiplier is a hot topic recently which many experts analyze with various methods.

Based on the analysis of the muiltiplicative structure of Koszul algebras given by Buchweitz et al,a sufficient and necessary condition for the multiplicative structure of Hochschild cohomology rings of Koszul algebras to be essentially the jux- taposition of parallel paths is obtained.

Results Two results on the weights of the sum ∩-structures and product ∩-structures are obtained.

The paper reviews the studies on structural Keynesian multiplier, and points out that the basic research and experience application of structural multiplier will provide more scientific perspective and more plentiful decision-making tools for the government to deal with external shocks and economic recession risks.

The classification methods for structural data and non-structural data;

The concept of information dynamic route based on information organization model was put forward,and the structural or the semi-structural data query was completed using the information route from host.

Starting from the object\|oriented ideas, and interrelations of product drawings, the paper presents the united managment method of structural and non\|structural data related to product drawings.