The purpose of this paper is to show that the mixing of the configurations can successfully be applied to deuteron stripping reactions when the angular distribution is characterized by two orbital angular momenta, and conversely that the percentage of the configurations can be determined from the observed relative heights of two peaks in the angular distribution. The calculations are based upon the perturbation theory. The agreement between the calculated and observed angular distributions is good. For the reaction F19(d, p)F20, the unexpectedly small reduced widths are reasonably explained from the standpoint of configuration mixing. Through the investigation of Mg25(d, p)Mg26*, we found that spin assignment of the first excitetd state of Mg26 is favourable to 2. Finally we discuss the relations between the type of mixing of the configuration used here and other types introduced to explain the quadrupole moments of odd nuclei.