  We study the affine $A_{n-1}^{(1)}$ Toda fields with boundary reflection. Our
approach is based on the free field approach. We construct free field
realizations of the boundary state and its dual. For an application of these
realizations, we present integral representations for the form factors of the
local operators. In a limiting case $\rho \to \infty$, our integral
representations reproduce those of form factors for the SU(n) invariant massive
Thirring model with boundary reflection
[nlin.SI/0010020,Int.J.Mod.Phys.A16,no.15 (2001)2665-2689].
