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In this paper, digital image processing techniques is applied in the field of strain measurement, using the displacement field - Newton iterative method, strain estimation process theoretical design analysis, the final completion of the deformation measurement of speckle pattern formation. Tensile strain gauge aluminum material by recording and digital image design in aluminum alloy material deformation measurements in contrast to the experimental results:strain measurement using digital image consistent with the recorder. Strain measurement can be achieved; component surface particle size of digital image speckle strain measurement design will have some impact. The proposed method not only achieve the design of the strain measurement accuracy, also improved to provide an easy to implement, effective techniques.