With the support of GIS, land use spatial data were scaled using two rules for rasterizing the vector

data, and the area accuracy loss of every type of land use was analyzed on the different spatial scales. Some

conclusions have been reached: （1）the area accuracy loss of any type of land use is under 2% at the grid size

under 80m when the rule of maximum area (RMA) is used, and at the grid size under 160m when the rule of centric cell

(RCC) is used; （2）at the grid size of 800m，the area accuracy loss of the water area is above 50% with the rule of

maximum area, while the area accuracy loss of the water area is above 20% with the rule of centric cell; （3）the

error of different land use types from the raster data with the rule of maximum area increases when spatial grain

increases, while the error with the rule of centric cell is randomly distributed when spatial grain increases.

According to RMA, the area accuracy loss of any type of land use shows a positive correction with the grid size.