Through the practice of the overall land use planning in Dalian and Liaoyang Cities and their two surrounding areas,we consider that ,in the overall land use planning at the city and county (district)levels, to apply the evaluation method of the ″double-orbit system″including both the evaluation of the current land use types and the evaluation of the suitability of the unused land to the evaluation of land resource is superior to using the method of land suitability evaluation in all cases. In this paper, Liaoyany City is exampled and brief introductions about the evaluation method of the ″double-orbit system″ and the effects of its application to the overall land use planning are given.