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Let(M2n+1,θ)be a 2n+1-dimensional,closed strictly pseudoconvex pseudo-Hermitian manifold with CR-dimension n.Let-(6)b be the-(6)-operator on L2(M)and-(6)* is its adjoint operator with respect to the measure θ ∧(dθ)n.The Kohn Laplacian acting on functions on M is defined by □b =-(6)*b.Let Pαf=(□bf)α+niAαβhβ-γf-γ Then the Paneitz operator P is defined by Pf=(Pα),α=-□b□bf+inn∑α,β=1(Aαβfβ)αIn this talk,I will present a joint work with Duong Ngco Son and Xiaodong Wang on CR-Obata theorem for Kohn Laplacian when n ≥ 2.