The authors present some new criteria for oscillation and asymptotic behavior of solutions of third-order nonlinear differential equations with a sublinear neutral term of the form(r(t)(z"(t))α)+∫dcq(t,ξ)f(x(σ(t,ξ)))dξ=0,t≥t0 where z(t)=x(t)+∫bap(t,ξ)xγ(τ(t,ξ))dξ,0<γ≤1.Under the conditions∫∞to-1/α(t)dt=∞ or∫∞tor-1/α(t)dt<∞.The results obtained here extend,improve and complement to some known results in the literature.Examples are provided to illustrate the theorems.