Moran index of spatial statistics,spatial error model and spatial lag model are used to analyze the regional innovation cluster and its causal factors,such as university and enterprise R&D expenditure,in China's 31 provincial regions in 2000-2002.The spatial econometric results show that heterogeneity and in- terdependence in the spatial distribution of provincial innovation and an obvious spatial cluster does exit,the main contribution to regional innovation cluster is enterprise R&D ex...