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Here we study and classify polarized threefolds whose Kodaira energies areless than -1/2. The Kodaira energy of a polarized manifold (M, L), a pairconsisting of a smooth complex algebraic variety M and an ample line bundle Lon it, is defined to be $-\Inf{t\in Q\vert \kappa(K+tL)\ge0}$, where K is thecanonical bundle of M and $\kappa$ denotes the Iitaka dimension of a Q-bundle.The method is a variant of those in my paper; manuscripta math. 76(1992).

On kodaira energy and adjoint reduction of polarized threefolds