In order to improve the quality of remanufactured engine,ensemble empirical mode decomposition(EEMD) decomposition and sensitive intrinsic mode function(IMF) selection algorithm is introduced in the study of remanufactured engine performance. Based on the EEMD decomposition, interrelated coefficient is drawn into the study of IMF, the interrelation between the IMF weight and original signal is analyzed, the original signal IMF weight’s sensitive determination is computed, then the sensitive IMF Hilbert commutation is used, and the vibration condition is analyzed. The results show that, using the EEMD decomposition algorithm and sensitive IMF marginal spectrum can reflect the vibration state on different parts of remanufactured engine. Cylinder, cylinder head, crankshaft, the sensitive frequency region of these three parts is different. Through the study of vibration condition of main parts, using manufacture technology, thus providing technology to improve Remanufactured Engine level.