Pressure measurement on blade surface of rotating MAU type propeller and cavitation tests were carried out in non-uniform flow. The measuring accuracy of the adapted pressure microsensor was not satisfactorily high regarding the stationary component. However, as far as the unsteady component is concerned, its accuracy appears sufficient for supporting the usefulness of unsteady lifting surface theory. In this calculation, it is also found out that circumferential wake component plays an important role for precise prediction of phase-shift.