There exist some imperfections in the current GIS based earthquake disaster mitigation systems that make them less efficient

thus it is very important for seismologists to develop a new system based on the updated computer technology.The WebGIS and AI based urban earthquake disaster mitigation information manage and decision support system is introduced in this paper in some details.Firstly

the GML based three-layer B/S architecture of the earthquake disaster mitigation WebGIS is described

which is divided into client

server and database and developed using ArcIMS as a development platform.In the database layer

the GML based geography spatial data model is built.The spatial data is represented using GML.It is easy for the heterogeneous data to be shared.Secondly

the multi-agent based decision support system is introduced

which is an important part of the earthquake disaster mitigation system.The agents include cooperation agent

interface agent

information agent

analysis agent

report agent and visualization agent.The system uses a blackboard to manage and cooperate these agents to implement the intelligent decision-making.Finally

the security ensuring of the system is discussed.