Faced to the problems of environmental resources diagnosis and land resources utilization decision during the regional comprehensive control and development, a current expert knowledge model has been designed.This model combines data bank with graphic bank through data dictionary and expert rules, calculation results can be transferred to special graphic and result data bank, it improves the working efficiency greatly.This design permits user to correct every item, therefore, strengthen the system flexility and enlarge the applying scope, it can be used directly in soil erosion intensity division, land suitablity evaluation, latent land productivity evaluation, land economic evaluation, and land utility planning.