Abstract: According to the theory of maximum stress,the mechanism of ascending rotary strength derived from the increasing density of grinding wheel is analyzed.And the effects of following factors on the density of abrasives are discussed,such as the forming pressure,drying and sintering and the friction between the forming materials and the mould.Based on the practical production,it is shown that under certain conditions,the tensile strength of the grinding wheel can be improved by increasing the density of the grinding wheel.When the repose angle θ of the distribution process,meets to 0<θ≤θ₀,the tensile strength of the grinding wheel can be effectively improved.