The paper gives a review on the development of Chinas paper industry in the last 10 years and points out that we have maderemarkable progress in the quantities of the products, the qualities of the products, the varieties, enterprise structure and economic profit.

In the adjustment of enterprise structures, not only should the components of enterprise elements be adjusted, but also the construction of operating system be strengthened.

Based on the modern industrial organization theory and the full and accurate data of construction en-terprises scale distribution and market competition,the business structure characteristics of Chinese construc-tion industry are systemically analyzed in terms of enterprise average scale,specialty division,difference of en-terprise scale and market competitive pattern.

Image evidence of the three-layer structure of the Lhagoi Kangri metamorphic core complex zone,south Tibet and its significance;

Furtherly,introduced are the system structure,the power setting and the flow of work,and described in detail is the design of three-layer structure of the system.

The meanings of three-layer structure are explained,and some suggestions on disposing the three-layer project are presented combining our practical application.

Design and realization of medical information query system based on three-tier architecture;

Design of road toll system based on three-tier architecture;

The Application of Three-Tier Architecture Distributed Database in Online Booking System;