Abstract: Rotary kiln is a key equipment in the production ofmetals, cement and refractory materials. For studying bending vibrationof its bodysystem related with its axis movement, the method of transfer matrix isdeveloped to set up the body system's dynamical model with the anisotropyequivalent stiffness equation of the wheel-bearing system.An example is given to illustratewhy there are dynamical errors in the common axis measurement methods. Thetransfer matrix model provides a basic equation for computing dynamicalstresses of roller and dynamical errors in the axis measurement.