The efficacity of defense-in-depth network security system should improved along with the development of network intrusion.

Based on the analysis of the security status,proposes using the security technology of different layer to build a defense-in-depth architec-ture for campus network.

The traditional IPS is analyzed and its advantage and insufficiency are poiated, then data fusion algorithm of multi-sensors is combined, and a "detection and defense - detection and response" model based on defense-in-depth theory and the intrusion tolerance is proposed.

Then a defense in depth network security model is proposed and the data mining technologies is applied to analyze the alerts collected from intrusion pre-vention system.

Then, the defense-in-depth and assurance framework of computer information systems is presented , and the functions and subsystems are described.

According to the arrangement of the State Flood Control and Drought Relief Headquarters, mountain flood prevention system was preliminarily built before the flood season of 2006 with the joint efforts of departments concerned, by applying the result of Studies on Mountain Flood Warning and Forecasting System Based on Distributed Hydrological Model that jointly comple.

The defensive system of fortress is a typical defensive system of "living with defending"of our country in ancient times.

This paper aims at comparing the above two cities from the geographical position,layout,structure and defensive system to have a deep understanding of the capitals during the Warring States Period.