In electronic speckleshearing interferometry, it is difficult to realize phaseshifting by separating two birefracting beams. The phaseshifting method of the translating Wollaston prism can introduce additional phase changes without separating the two beams. The principle of the phase changes introduced by translating Wollaston prism was discussed. The relationship between the magnitude of translation and the additional phase was offered. A typical experiment about the method presented was completed by using a centrally loaded clamped circular plate. The obtained results show that the translating Wollaston prism method of phaseshift can effectively obtain displacement derivative field from fringe patterns of a test object.