In the present article, the use of slave-boson mean-field theory of the ext
ended Anderson lattice model has been generalized to the Nambu space. The G
reen's functions of heavy fermion superconductors (HFS) have been obtained.
The high sensitivity of the d-wave pairing HFS to the nonmagnetic impuriti
es has been studied. The obtained results are in good agreement with the re
cent experiments on HFS.