The dynamics analysis of vibration isolation system for compressor of food refrigerating unit, including Modal analysis and Harmonic analysis, were made by ANSYS software. The parameters such as the natural frequency of the system were obtained, which can be used to verify whether the isolation system design has successfully overcome the fatigue caused by the forced vibration, resonance and other hazards. The results are important for the vibration and isolation design of compressors in food refrigerating unit, and also provide the meaningful basis for the research on vibration and noise reduction in large-scale food refrigerating unit.