Abstract：The application of moving least square method to simulation of in-situ stresses with large depth is presented in this paper. Based on the analysis of the principle and model of calculation for the moving least square method，the measured pore pressure data are used to fit the known data. The number of selected known data and the two adjustment coefficients in the model have influences on simulation result. The impact extents of every factors are analyzed. The main factor is the number of selected known data，the second factor is the two adjustment coefficients，and the third factor is the values of data. In addition，the fitting effect of boundary and numerical stability of the moving least square method are discussed. The results show that the moving least square method has better simulation result with satisfactory stability. In order to improve the fitting precision of calculation model，some suggestions are put forward with a practical example.
