The new decision support technologies：Data W arehouse，OLAP and Data Mining，developed in the middle of 1990s，open a new way to decision support system (DSS)by acquiring assistant decision information from databases．Based on the discuss of development progress，key technologies，research evolvements of DSS，the paper puts forward a new architecture of decision support system ，which integrates Data Warehouse(DW)，Data M ining(DM)，Model Base(MB)，Expert System (ES)，On—Line Analytical Processing(OLAP)