Abstract: A safety test using open source tools was put forward to construct four layer network scan architecture pattern for monitoring server safety, it also can get an automatic analysis report of threaten for the administrators. Through the timing detection mechanism based on process from hardware to software, from the operating system to the service application even to the dynamic page script to build a full range, customizable，flexible combination of multi-level security scan and collect the results which are analyzed, the results are directly sent the mail to the administrators, and the suggestions for repair are put forward. Therefore, the server security vulnerabilities can be found and the purpose of repair can be achieved in time. And this method can reduce the burden of manual detection monitoring server for administrators, and effectively avoid security problems for administrators’ technical reasons. Finally the experimental results also show that the establishment of security vulnerability scanning alarm system will make the security of campus network servers more reliable than before.