Abstract: With the Sand culture method, influences of different magnesium levels (0%、50%、100%、150%、200% and 300%) was explored to the wheat seedlings of different stages. Many targets such as plant height, root length, biomass, content of chlorophyll, activity of root, RGY, RGR and ratio of root to crown of the wheat were mensurated at the time of 7d, 15d and 30d of two leaves stage of wheat seedlings after their endosperms were removed at different magnesium levels.The results showed that different magnesium levels had unlike influences over the wheat seedlings. The growth of whole wheat was suffered seriously influence when magnesium was lacked（0%）; promoting root growth and restraining the other parts growth happened when magnesium was deficient（50%） and there was a little influence when magnesium was excessive（150%、200%）, but with magnesium content addition（300%）, the influence became visible, especially for the roots of wheat. In the different magnesium level treatments, RGR vary with RGY, particularly prominent for the ground parts of wheat, but not for the roots. It showed that the variation rate of biomass was influenced mainly by leaf length for ground parts of the wheat and for the root, influenced not only by the primary root length, but also by the secondary roots. In addition, in the terms of RGR and RGY of 3 stages of wheat seedlings, the result was 15d>7d>30d.