Spatial data for geographic information system is as important as the petrol for vehicle. Spatial data quality is more important factor for evaluating the analysis results if they are correct or reasonable in GIS. In this paper

a spatial data quality model is presented according to the method used for evaluating the spatial data quality

and a measurement model of spatial data quality is also given. Both two models

which are used for scientific and reasonable assessment of data quality as well as exact and unitary representation of data quality

are of great importance at conceptual level.