  We explore AdS/CFT correspondence between geodesic Witten diagrams and
conformal blocks (conformal partial waves) with an external symmetric traceless
tensor field. We derive an expression for the conformal partial wave with an
external spin-1 field and show that this expression is equivalent to the
amplitude of the geodesic Witten diagram. We also show the equivalence by using
conformal Casimir equation in embedding formalism. Furthermore, we extend the
construction of the amplitude of the geodesic Witten diagram to an external
arbitrary symmetric traceless tensor field. We show our construction agrees
with the known result of the conformal partial waves.
