A new method is proposed based on EEMD and Mixture Gaussian hidden Markov mode（MGHMM） for gear fault diagnosis.Firstly

a simulation signal is used to verify the advantages of EEMD comparing to EMD in eliminating the mode mixing;secondly

the framework of gear diagnosis based on EEMD and MGHMM is built;thirdly

the new method is applied to the gear fault diagnosis.The results show that the method can identify gear fault accurately and effectively.