The intrusion detection system is one of the key technologies for network safety. Smart technology is one important branch, and the detection technology intellectualized is an important development. But the present systems are not perfect. Based on the biological memory principles, this text combines Biological Immune and Catastrophe Theory etc into the present intrusion detection system frame, and propose a new instrusion tolerance trigger model based on biological immune and catastrophe theory , in order to make the invade detection system more intelligent.