A spatial support system on farmland suitability evaluation was designed and implemented based on the commonly procedure of farmland suitability evaluation in the paper.The components and their content of the system were discussed,and techniques such as Geodatabase model,ArcObjects components,and ADO interface were used to realize the system.The application in farmland suitability evaluation in Fengqiu county indicated that the system can manage spatial and characteristic data efficiently,and fulfill decisi...