A computerized simulation method for evaluating dispersion of fillers in a high polymer material, the method comprising: defining a filler model available for use with the computerized simulation, the filler model comprising at least one particle; defining a polymer model available for use with the computerized simulation, the polymer model comprising a plurality of particles (2, 5), wherein each particle (2, 5) represents an atom, a group thereof or a molecule of the molecular structure of the polymer material, the particles (2, 5) of the polymer model comprising a plurality of non-modified particles each having a first potential with respect to the particle of the filler model and at least one modified basal particle representing a modifying agent or modified polymer and having a second potential with respect to the particle of the filler model, wherein the second potential has a high affinity to the particle of the filler model as compared with the first potential; defining a cell on the computer, wherein the cell is a virtual space corresponding to a micro part of the high polymer material to be analyzed; performing a molecular dynamics calculation of the filler model and the polymer model placed in the cell; observing the dispersion of the filler model from data obtained in the molecular dynamics calculation through a quantitative observation for evaluating dispersion of the filler model; wherein observing the dispersion of the filler model includes calculating a radial distribution function of the filler models using a computer, and comparing it with respect to a predetermined threshold, and characterized in that the first potential is defined so that a repulsive force between two particles (2, 6) occurs, the second potential is defined so that a repulsive force between two particles (5, 6) occurs and the repulsive force based on the second potential is weaker than that of the first potential. defining a filler model available for use with the computerized simulation, the filler model comprising at least one particle; defining a polymer model available for use with the computerized simulation, the polymer model comprising a plurality of particles (2, 5), wherein each particle (2, 5) represents an atom, a group thereof or a molecule of the molecular structure of the polymer material, the particles (2, 5) of the polymer model comprising a plurality of non-modified particles each having a first potential with respect to the particle of the filler model and at least one modified basal particle representing a modifying agent or modified polymer and having a second potential with respect to the particle of the filler model, wherein the second potential has a high affinity to the particle of the filler model as compared with the first potential; defining a cell on the computer, wherein the cell is a virtual space corresponding to a micro part of the high polymer material to be analyzed; performing a molecular dynamics calculation of the filler model and the polymer model placed in the cell; observing the dispersion of the filler model from data obtained in the molecular dynamics calculation through a quantitative observation for evaluating dispersion of the filler model; wherein observing the dispersion of the filler model includes calculating a radial distribution function of the filler models using a computer, and comparing it with respect to a predetermined threshold, and characterized in that the first potential is defined so that a repulsive force between two particles (2, 6) occurs, the second potential is defined so that a repulsive force between two particles (5, 6) occurs and the repulsive force based on the second potential is weaker than that of the first potential.