Imbibition is a key factor which decides the effect of tight formation development, and clarifying the hydraulic fracturing (HF) fluids imbibition mechanism and influencing factors have a great significance to the production characteristics after hydraulic fracturing. In this paper, volume method is adopted to conduct hydraulic fracturing fluids imbibition experiments with oil-saturated cores, and then effect and influencing degree of HF fluids, core permeability, experiment temperature, core length and oil viscosity on imbibition recovery and rate have been studied. The results show that recovery changes positively with permeability and experiment temperature, and it changes negatively with HF fluids, core length and oil viscosity. Imbibition rate presents a fast increase at beginning, and then drops quickly at the followings. The influencing sequencing of factors is: HF fluids > oil viscosity > experiment temperature > core length > core permeability. Comprehensive evaluation should be conducted after hydraulic fracturing to give support to the development.