Owing to unsteady ship driving power, vibration of ship body, sealing function of seal part and variable stern flow companying with rotating propeller, the unsteady force results to vibration of ship shaft, which makes the oil film of stern journal bearing vibrate.

The disquisition not only discusses a method of how to use similarity theory to building ship water-lubricating bearings but also infer a corresponding similarity standard, building stern bearing test-bed by using this method can simulate strained and lubricated of reality stern bearing.