In the present paper the data analysis for EXAFS (extended x-ray absorption fine structure),starting from the treatment of the raw data to the extraction of the structural information has been described. The background subtraction, Fourier filtering, and the choice of the threshold energy were discussed. Furthermore, the curve-fitting method was given for the improvement of accuracy, Using the method various samples (Cu, CuNi and CuNiMn) were studied,and the results obtained were quite satisfactory.