The capital circle including47counties and cities is one of the most important sand/dust storm source areas for sand/dust storms of recent years that have affected some metropolis such as Beijing and Tianjin.This situation is highly concerned by the whole society.According to the features of eco - geographical regions of the circle,Daxing is a case standing for the north rim of defoliated broad - leaved forest and shrub - grass region of North China,Huailai is for shrub and grassland of the Sangganhe River and Yanghe River Basins,and Zhangbei is for steppe of west Bashang Highland.Objectives of this study are to control and to reduce the possibility of sand/dust storm through re-allocation of the usage of water-land resources.Data for the study are from“Land Use Database”of China Resources and Environment Remote Sensing Data Base;1∶1000000Land Resources Map of China;and the local government statistics and field surveys.Analysis indicated that main problems for the causes of dust/sand storm occurrence are illogical land use structure,irrational land use allocation and unsatisfied water resource for land use requirement.Taking water resources supply and land-use types as the two most important restraining factors,gray linear programming model was applied to re-allocate water-land resources.Sand/dust storm prevention and control was taken as the first objective of the model.Economic development and sustainable regional development is the second.Different scenarios for different objective schemes were completed.Geographical information system(GIS)technology was employed to map the different scenarios /schemes.Land use type conversion based on water resources limitation is the main way to achieve the scenarios.Common measurements are sandy land controlling and bare land coverting.Converting parts of dry farmland to medium coverage grassland is the special measurements for Daxing;converting sloping(higher than15°)farmland to grassland is for Huailai;and reducing dry farmland and increasing coverage of grassland are for Zhangbei.