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<正> We find that a kind of atomic coherent state,formed as exp[ζJ_+-ζ~*J_-] |00〉,when the SU(2) generatorsJ± are taken as Fan's form,J_+=(1/2)(a_1-a_2~+)(a_1~+-a_2),J_-=(1/2)(a_1~+ + a_2)(a_1 + a_2~+),and J_0=(1/2)(a_1~+a_2~+-a_1a_2),is sim