Abstract: Sandy desertification is one of the most important problems in the world.The hazard degree assessment is an important and basic study subject of sandy desertification issues.This paper first analyses the conditions of study on the assessment hazard degree of sandy desertification at home and abroad,establishes the criteria system of hazard degree assessment and gives the classification standards (class limits) of every assessment criterion.The assessment model for hazard degree of sandy desertification is given the first time: where:SDH:index number of hazard degree; W_i:weighting number;F_i:degree index number.This paper gives one simple but very useful method to assess the hazard degree of sandy desertification.At last,Naiman county in Inner Mongolia is taken as an example to examine the assessment model, it has been proved that the assessment model or method is very favourable to assess the hazard degree of sandy desertification.