In order to easily measure,predict and further control the internal residual stress of thick aluminum alloy plates,first,the internal residual stress of thick 7075 aluminum alloy plate was measured by crack compliance method based on 3-factor 3-level orthogonal experiments.Next,the distribution law of the residual stress was summarized,and a shape function describing the stress distribution was established according to the distribution characteristics of the stress.Then,the relationship between the stress at key points and the residual stress of the plate surface was revealed via the nonlinear regression,and a model to evaluate the residual stress field of the pre-stretched plate was put forward.The model was applied to the evaluation of residual stress of a certain Al alloy plate,with its feasibility being verified at last.