In this paper, Digital Image Correlation method (DIC) and the introduction of a new Nondestructive method for measuring RESIDUAL STRESSes in mechanical parts has been investigated. In this regard, with the purpose of scientific proof of the proposed new method, a review of the related work to the presented idea and its details has been discussed. Initially, the principles of digital image correlation method and the methods used to calculate correlation coefficients are presented. In order to evaluate the accuracy of digital image correlation method outputs, by construction the required equipment and doing experimental tests, comparing the output results of the digital image correlation method and the simulation results of finite element are discussed. In the following, the proposed method for measuring the RESIDUAL STRESSes in mechanical parts by applying loads in the elastic and Nondestructive area has been discussed. The proposed relationship, which is based on Hooke's law, is capable of evaluating and calculating RESIDUAL STRESSes in a Nondestructive, full-screen, and high-precision manner. For scientific proof, the steel samples are welded by the SMAW process and the amount of RESIDUAL STRESSes found in the parts has been calculated.