  Primary fields of the $q$-deformed Virasoro algebra are constructed.
Commutation relations among the primary fields are studied. Adjoint actions of
the deformed Virasoro current on the primary fields are represented by the
shift operator $\Theta_{\xi} f(x)=f(\xi x)$. Four point functions of the
primary fields enjoy the connection formula associated with the Boltzmann
weights of the fusion Andrews-Baxter-Forrester model.
