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After understanding the intrusion methods commonly used by hackers, it is not realistic to plan separate protection strategies for these methods. Therefore, users can only master the common protection strategies of personal computer security to ensure that the computer is in a relatively safe environment. Common PC protection strategies include: installing and upgrading anti-virus software, enabling firewalls, preventing Trojans and viruses, sharing folders and regularly backing up important data. The emergence of viruses has caused huge losses to computers on the Internet. These viruses can cause the system to fail to operate normally, and the system will be formatted and data will be formatted. In order to prevent the harm caused by these viruses, users need to install anti-virus software on the computer and turn on real-time monitoring. In addition, due to the improvement of virus production techniques and means, new viruses are constantly appearing, so users need to upgrade anti-virus software in time, so that anti-virus software can prevent new viruses in the Internet. A firewall is a method of separating a computer’s internal network from an external network. In fact, this is an isolation technique. A firewall is an access control scale that is executed when two internal and external networks communicate. It allows users’ licensed computers and specific data to enter the internal network, preventing hackers on the external network from accessing and attacking themselves to the maximum extent.