Vibration test of a certain type of scroll compressor was conducted according to its vibrations and the high-frequency vibration spectrum for each of the major components of the compressor was achieved. Modal analysis of scroll compressor was carried out through finite element analysis software ANSYS and the first six natural frequency was achieved. The result of vibration spectrum analysis and comparison of the vibration spectrum and natural frequency shows that there is resonance phenomenon on upper shell and the shell contacting with housing is prone to fatigue damage. Three improvement programs have been putted forward. They are increasing the thickness of the upper shell, increasing the radian of the upper shell and increasing the thickness of the shell contacting with housing. The programs were verified through ANSYS. The result of verication shows that increasing the thickness of the shell contacting with housing and increasing the radian of the upper shell are effective.