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We study the four-wave mixing(FWM)in an opening five-level system with two dressing fields.There are threekinds of doubly dressing mechanisms(parallel cascade,sequential cascade,and nested cascade)in the system for doubly dressed four-wave mixing.These mechanisms reflect different correlations between two dressing fields and different effects of two dressing fields to the FWM.Investigation of these mechanisms is helpful to understand the generated high-order nonlinear optical signal dressed by multi-fields.