The purpose of the orientation marker for two sets of bearings is that the compensation of the deviation can be considering that both the respective rotation accuracy of the two ends have improved, but also make the two-socketing seat holes and two ends of the two-end journal Error Get partial elimination. Surface enhancement measures are implemented on the surface of the fitting surface, such as sandblasting treatment, with a slightly large sequester column plug in a diameter, etc., is conducive to improving the fitting accuracy.