In order to solve the problems of being too viscous and with low yield in the viscous alkalize solonchak soil in Inner Mongolia Hetao Plain,a soil improvement experiment was conducted by mixing sand to soil plough layer(0～20 cm)in Hetao Plain viscous alkalize solonchak field,to study its effects on soil physical properties and corn yield.The results showed that mixing sand to soil plough layer in Hetao Plain viscous alkalize solonchak field reduced soil bulk density,changed the soil mechanical composition and soil texture,increased soil aeration porosity of viscous alkalize solonchak soil,improved soil aeration,water permeability,reduced the soil total salt and degree of alkalization，effectively improved growing environment of corn plants,increased the yield of corn.The soil bulk density with adding 20% sand decreased from 1.64 g/cm3（CK）to 1.49 g/cm3,soil aeration porosity increased from 8.57% to 18.17%,which reached the normal range.Adding 20% sand made the ratio of soil sand,silt and clay content tend to moderate,soil texture turn from loamy clay to clay loam,soil total salt fall by 13%,degree of alkalization been reduced by 21%,the yield of corn been increased by 301%.Adding sand of 20% was appropriate proportion to improve viscous alkalize solonchaks soil on Hetao Plain.