The relationship formula for the vertical and horizontal resolution coordination in the centered finite difference scheme of the adveetion equation(the vertical and horizontal spatial deviatives in the adveetion equation being transformed into centered difference)is derived and fully discussed from the two-dimensional linear advection equation(the two dimensions are in x and y directions)and on the principle of equality in the truncation error caused by vertical resolution and that caused by horizontal resolution in the difference equation.This study is important for the determination of the vertical levels and horizontal grid spacings in the Mid-Range Numerical Weather Forecast Model of China.