Abstract: Misalignment of shaft journal usually takes place in shaft-bearing system and can not be neglected in the design of bearing. With different slant angles of shaft journal, numerical simulation on dynamic contacting behavior of roller bearings were carried out by using dynamic finite element models based on ANSYS/LS-DYNA. The effect on contact elements from the changing of slant angles was obtained by comparing and analyzing the value of distortion and stress. And dynamic contacting characteristics of a cylindrical roller bearing considering misalignment were investigated here carefully. It found that the maximum value of von mises stress and shear stress on rollers would be much bigger when considering misalignment of shaft journal. In the three cases of that slant angle were 0°, 0.1° and 0.5°, the maximum value of von mises stress on rollers were 700 MPa, 2.73 GPa and 4.0 GPa separately. The value of the stress on end face element and the distribution of the stress on contact position were all changed with the slant angles. While impact on the displacement of the axes along loading from slant angles was very small, and the displacements were all around -0.2-0.3 mm. Conclusions were expected to give some useful references for the study of dynamic contacting characteristics of roller bearing and the optimum designing of bearing structure when considering misalignment.