The popularity of the Internet brings rich and interesting network resources, but it also brings threats to our online security and privacy. For example, advertisers monitor users' online activities through the Internet; hackers break into users' network connections; malicious attacks on harmful websites are increasingly rampant, and so on. As we all know, using anti-virus software alone is not enough to guarantee our online security now. Therefore, we also need a reliable network security software to provide comprehensive protection.