The differences of Mo absorption and its relationship with root morphology between Mo-efficient winter wheat cultivar 97003 and Mo-inefficient winter wheat cultivar 97014 were studied with nutrient solution culture.The results showed that the accumulation of Mo at shoots of cultivar 97003 was higher than that of cultivar 97014 under Mo deficiency.In addition cultivar 97003 had higher ability of transferring Mo to leaves than that of cultivar 97014.Under two Mo levels,Mo accumulation in leaves and the whole plant of cultivar 97003 was 86.2% and 96.3%,higher than that of cultivar 97014,which was 78.9% and 87.2%.The root morphology of two winter wheat cultivars under Mo deficiency were different,cultivar 97003 had good root morphology.The root length,surface area,volume and average root diameter of cultivar 97003 were 1.16,1.41,1.21,1.73 times higher than those of 97014,surface area,volume and average root diameter were all significantly higher than those of 97014.The root length,surface area,volume and average root diameter of cultivar 97003 were 1.13,1.28,1.12,1.44 times higher under Mo deficiency than those in providing Mo treatment.Expected root length,surface area,volume and average root diameter were all significantly higher than those in providing Mo treatment.In contrast,root length,surface area,volume and average root diameter of cultivar 97014 had no significant difference whether providing Mo or not.