ProSecurity is kernel-level security protection software based on behavior detection. By intercepting and protecting system behaviors such as application loading, cross-process operations, registry operations, file/folder operations, network access, direct physical memory access, installation of Windows hooks or system services/drivers, it can prevent malware (malicious programs) from damaging your system, increasing their privilege and stealing your data, so as to realize system protection and malware detection. Antivirus software in the traditional sense has greatly prevented the spread and rage of viruses, trojans and worms. Nowadays, however, these malicious programs spread faster and faster with the wide spread of global networking. There even appeared many personal malware editions - they are only used by certain persons in a narrow range. Under such circumstances, updates of traditional antivirus software based on feature code scanning have been unable to meet the requirements of network security. It has been very hard for us to be properly protected by antivirus software due to the vast amount of such 0-day attacks. To solve these problems, we released ProSecurity Host-based Intrusion Prevention System. It features a kernel-based security protection solution which can intercept behaviors threatening host security, and implement some measures in reaction: allow, block or let the user to decide whether to allow this action, so as to block malware intrusions. ProSecurity is a valuable supplement to antivirus software and firewalls. All protection jobs of ProSecurity are implemented independently by kernel modules which run without the help from application-level programs, so the program works smoothly and occupies very little system resources.