We discuss the existence, uniqueness and stability exponential and polynomial of global solutions for a nonlinear coupled system with nonlocal boundary conditions given bywhere Ω is a bounded region in 2 whose boundary is partitioned into disjoint sets Γ 0 , Γ 1 . We show that such dissipation is strong enough to produce uniform rate of decay. Besides, the coupled is nonlinear which brings up some additional difficulties, which makes the problem interesting.