The generalized elliptic Ruijsenaars models, which are regarded as a d
ifference analog of the Calogero-Sutherland-Moser models associated wi
th the classical root systems are studied. The integrability and the d
uality using the fusion procedure of operator-valued solutions of the
Yang-Baxter equation and the reflection equation are shown. In particu
lar a new integrable difference operator of type-D is proposed. The tr
igonometric models are also considered in terms of the representation
of the affine Hecke algebra.