It has become one of the most difficult technical problems to solve the distortion of the integrated part caused by the residual stresses during the machining process. The residual stresses in the pre-stretched aluminum alloy plate 7075T7351 are measured by using the crack-compliance method, and the distribution regularity of the residual stresses is analyzed in detail. Furthermore, the measurement done shows that the maximum residual tensile stress of the aluminum alloy plate 40 mm thick is 18.3 Mpa in the direction of its length and its maximum residual compression stress is 17.9 Mpa.