Abstract. In the computer network crime and network security means defense technology escalating the situation, a growing number of technical and legal experts come to realize, is completely dependent on network security technology to combat computer-related crime can not be very effective, it must apply the law deterrent sanctions and technical preparedness to jointly curb cybercrime, Network Forensic technology is in this situation and developed, it belongs to an active network security defenses. But whether it is the concept of network forensics technology or greater extension of the scope of Computer Forensic technology, it has not yet formed the theory, method and system of systems. Computer forensics technology has become a hot research topic in recent years, the field of computer science and law intersect, this paper presents a study on electronic data forensics system based on C/S structure.