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The normalized supercoherent state of the orthosymplectic(OSP)(2,1) superalgebra is constructed and its properties are discussed in detail. The new inhomogeneous differential realizations of the OSP(2,1) superalgebras are given. It may be of use for determining the new concrete structure of the quasi-exactly-solvable Hamiltonian corresponding to the OSP(2,1) supersymmetric quantum system.