By using the remote images in 2003, 2006, 2009, 2013, the article classifies the land use of Changsha City. With the support of Arc GIS 10.0, ENVI 4.8, Fragstats 4.0 and Excel 2007 software, it analyzed spatial grain effect of land use pattern changes by changing the space grain sizes on class level pattern indices and landscape level pattern indices. The optimal proportion method was used. We have drawn the follow conclusions: 1) On class level, with the increase of spatial grain sizes, all kinds of index ...