本文结合地质勘查单位实际的内部控制情况，提出内控制度制定存在的问题，并以地质勘查单位的未来发展道路为基础，研究出健全地勘单位内部控制制度，壮大地质勘查单位实际竞争能力的对策。

This paper discusses how to design and implement this filtering system,a general model of content and url based security filtering is put forward.It discusses the theory and implementation methods,including the system architecture,the communicate technology between management machine and monitor terminal,the data structure of the communicate packet.This system runs on Windows 98 or Windows 2000/XP operating system,it shows that system performance is stable,the sensitive information can be filtered effectively according to rule-database,and achieves the anticipated design.