A combined compensation scheme for passive vibration isolation and active acceleration compensation is designed to improve the deterioration of dynamic phase noise of crystal oscillator. In this solution, a two stage rubber shock absorber is used to realize good passive vibration isolation and optimize the dynamic phase noise of crystal vibration beyond 300 Hz. At the same time, the active acceleration electric compensation method is utilized to make up the resonance problem of the passive vibration isolation system at the near end (about 220 Hz), and the dynamic phase noise of 10~200 Hz is optimized. The results of the vibration experiment show that the combined compensation method can optimize the dynamic phase noise of crystal oscillator by 15~35 dB from the range of 10 Hz to 2 000 Hz away from the carrier.