  An integrable Kondo problem in the one-dimensional supersymmetric extended
Hubbard model is studied by means of the boundary graded quantum inverse
scattering method. The boundary $K$ matrices depending on the local moments of
the impurities are presented as a nontrivial realization of the graded
reflection equation algebras in a two-dimensional impurity Hilbert space.
Further,the model is solved by using the algebraic Bethe ansatz method and the
Bethe ansatz equations are obtained.
