In the present work,the self-energy effect on the superfluidity of neutron matter in the channel~1 So has been investigated in a generalized BCS theory.The ground-state correlations in the self-energy have been taken into account.The result of the calculated energy gap is shown in Fig.1~[1]in which,the solid line indicates the In the present work, the self-energy effect on the superfluidity of neutron matter in the channel ~ 1 So has been investigated in a generalized BCS theory. Ground-state correlations in the self-energy have been taken into account. The result of the calculated energy gap is shown in Fig. 1 ~ [1] in which, the solid line indicates the