By using the degrees of polarization (DOP) ellipsoid method,the values of differential group delay (DGD) and the direction of the principal sterte of polarization (PSP) were obtained from limited sampling data in the experiment,which provided the most key factors of the feed-forward compensation scheme. Moreover,the values of DGD obtained from the experiment were accordant with that of the theoretical values when the DGDs were less than 30 ps. Results indicated that DGD and the orientation of PSP could be obtained by using the DOP ellipsoid method in the experiments.