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we restrict the open string end on the circular Brane. The variation of Bosonic string's action give the Bosonic boundary condition. Expanding to the supersymmetry string's action, and requiring the boundary conditions are invariant under supersymmetry, we get the supersymmetry boundary condition. Using the solutions of the string equantion ,the boundary condition could be simplified and the boundary state is obtained when R>>alpha_1/2. The boundary state satisfys some restrictions by the super-Virasoro generators, is BRST invariant after add the ghost. At last we give the boundary state of general curving D1 brane. t
Keywords:heoretical physics;D brane;Boundary states