This paper instructs the principle and architecture of DFW and discusses the kernel function,the most modules and the working flow of host firewall.

Then the design and implementatiom technology of the Windows-based host firewall are exposed in detail.

At present, there comes various security technologies of host, and many of them get abroad application, and Host Firewall and Host Intru.

This thesis mostly concern design and implement a kind of new modern host-based firewall for PC based on Windows operation system which provides host network security.

Then research the function of mobilephone firewall and its realization approach deeply.

So we introduce a new distributed firewall system called active-firewall.

The height of the fireproof wall should be increased and painted steel screen should be added on the exterior wall to prevent fillets in the wall from flying off in the case of an explosion.

And it also analyses the installment schemes of various fireproof walls and attempts to ensure the balance between the cost and efficiency under specific conditions so as to enable the system to operate in a safe, stable and effective way.

In this paper,the author,by drawing up the hardware conditions and software conditions,gives some specific proposals in dealing the management of campus network function,net security and fireproof wall,etc.