We investigate the forced oscillation for a class of neutral delay parabolic partial differential equations of the form:δ/δl(u(x,t)-pu(x,t-τ))-∑k=1^r αk(t)△u(x,t-ρk(t))+∑j=1^mqj(t)u(x,t-σj(t))=e(x,t)where (x,t)∈Ω [0, ∞]≡G, Ω is a bounded domain in R^n with a piecewise smooth boundary ,δΩ and △ is the Laplacian in Euclidean n-space R^n with three differential boundary conditions.and the forcing term e(x.t) is a oscillatory function defined on G.Some new oscillatory criteria are obtained. Our res...