Aiming at the traditional passive deception models, this paper constructs a Decoy Platform based on Intelligent Agent (DPIA) to realize dynamic defense. The paper explores a new dynamic defense model based on active deception, introduces its architecture, and expatiates on communication methods and security guarantee in information transference. Simulation results show that the DPIA can attract hacker agility and activity, lead abnormal traffic into it, distribute a large number of attack data, and ensure real network security.Research on network security has come into a phase of information assurance, which sets up the architecture of dynamic network security defense. There are many very important researches in network security fields, such as how to get the latest attack evidence from hackers, how to decipher their attack technology, how to track them, and how to find out potential possibility about whether or not the system may be attacked. However, decoy technology is one of the best means to solve those problems.Decoy refers to tempt invaders into a virtual environment in order to monitor, track, and record their actions. The most popular deception methods at present are honeypot and honeynet. The honeypot is a host computer that simulates some 1 Manuscript