Abstract: To reveal the resonance characteristics of cavitation bubble in the grinding fluid during ultrasonic honing, experimental observations on the grinding fluid of oilstone surface were carried out firstly using microscope VHX-600ESO. The cavitation bubble in the resonance state was observed. Based on the bubble dynamics, the resonant frequency equation was established for cavitation bubble in the grinding fluid during ultrasonic honing. The effect of ambient bubble radius,ambient pressure,gas content and ambient temperature of water and kerosene on bubble resonant frequency in the grinding fluid was numerically simulated respectively. The coordination relationship of ultrasonic frequency and cavitation bubble resonance frequency was verified by analyzing the displacement of a cavitation bubble. The results show that the resonance cavitation bubble occurs more easily in water than in kerosene at the same conditions, which is an important reason that water can be selected in coarse honing and kerosene can be chosen in fine honing.