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A data based intelligent decision support system is proposed to solve problems of decision making of tourism management in complex environments. Firstly, the architecture of the decision support system integrated with several intelligence technologies is proposed, and some key technologies of implementation, such as 3S and decomposition of large decision table are also introduced. Then, some data analysis methods used in this decision support system are presented, which include tourism information categories, space time pattern of tourism status, tourism planning and navigation, early warning of tourism status and safety incidents. Finally, several applications of this system are also given.