Dividing Grid unit is the number of digital urban management information system is an important basis of the preliminary work,and other cities in the success of the pilot,in the western city of Urumqi,and dividing grid unit relevant to the work of meshing the basis of lack of information on line,more work Difficulties.

Study on rationaldeterm ination ofthe grid unit in city and tow n land classification;

0km grid cells as the statistical units,according to the potential grain productivity of different types of cultivated land and using the analytical methods such as spatial analysis under the suppport of ArcGIS,this paper ascertains the area of the basic farmland which should be protected for Jinan,and also plans the spatial distribution of basic f.