Because of the existence of regional variability in natural and economical condition in agricultural production

proper agricultural division is essential that different developing strategy can be adopted for every zone. However

establishment of agricultural division requires large

unwiedly geographical-referenced data sets and spatial adjacency relationship

it is difficult to utilize many cenventional mathematical methods. In the study

Geographical Information System was used to manipulate and analysis spatial data

Optimal-tree Cluster was adopted for division. This integrated methodology was programmed as applied model and embedded in Soil Information System

case on Longyou county

Zhejiang province. Advantage of this integrated methodology is easily and quickly with low cost

compared to agricultural division by local bureau. Furthermore

the result is also suitable for the practical situation.