In this article, we both presented the concept of coherent and squeezed stochastic vacuum and simultaneously specified the way to calculate resonant fluorescent spectrum in two- or three-level system with configuration Λ in the presence of squeezed stochastic vacuum. The effects that occurred in the presence of squeezed stochastic vacuum were the change of both the width and the height of central spectrum and of additional narrow peaks. The impacts of squeezed vacuum on fluorescence spectrum represent the dependence on the squeezed parameter of both amplitude and phase. In the absence of unsqueezed vacuum, fluorescent spectrum returns to normal Mollow spectral type.
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