Abstract: According to elastic coefficient formula of elastomer in series and Hooke＇s law,the formula of the distance of the same particle relative to elastomer fixation is deduced,a mathematical expression of uneven elastomer deformation is given,and the mass distribution and position of the center of mass of a elastomer are discussed.

Key words: elastomer, coefficient of stiffness, Hooke＇s law, mass distribution, center of mass, gravity field