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We investigate the infl uence of the filed fl uctuations to the emission photons of V three-level systems. The emission intensity I and Mandel’s Q parameter show stochastic resonance with respect to the pure dephasing constant γp. The amplitude fl uctuation of the field causes the systems lose their coherence, on the other way, the amplitude fl uctuation provides a new interference way for the systems. The quantum beats are shown in the orthogonal system.