There now appears urgent need for embedding spatial data into decision support system(DSS) which pro2 vides spatial analytical function and visualization to user. This article investigates a decision analytical tool based on spatial data warehouse —On2line analytical processing (OLAP) . We mainly solve the serious problem of slow re2 sponse time in spatial data cube operation by improving materialization view selection method. And then , an analysis example is given to test the efficiency of our work. Furthermore we enrich the spatial OLAP model and its applica2 tion mode to realized more powerful and flexible spatial analytical functions.