The global well-posedness for the KP-Ⅱ equation is established in the anisotropic Sobolev space $ H^{s, 0} $ for $ s>-\frac{3}{8} $. Even though conservation laws are invalid in the Sobolev space with negative index, we explore the asymptotic behavior of the solution by the aid of the $ I $-method in which Colliander, Keel, Staffilani, Takaoka, and Tao introduced a series of modified energy terms. Moreover, a-priori estimate of the solution leads to the existence of global attractor for the weakly damped, forced KP-Ⅱ equation in the weak topology of the Sobolev space when $ s>-\frac{1}{8} $.
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