Abstract: LiMn2O4 were prepared by CMD and pretreated CMD. The structure and morphology of different LiMn2O4 were studied through XRD and SEM．Electrochemical properties were investigated through Charge-discharge testing．The result shows that all of LiMn2O4 have regular spinel structures. LiMn2O4 synthesized by CMD pretreated at 800℃ has the most stable crystal structure and uniform particle size, which shows the best electrochemical performance. The first discharge capacity is 118.4mAh/g，and the capacity retention is 92.74％ after 100 cycles. Key words:CMD; pretreatment; LiMn2O4；electrochemical properties