Li4Ti5O12 powders were prepared by so-gel method using tetrabutyl titanate,lithium acetate and absolute alcohol as starting materials.Li4Ti5O12-polyaniline (Li4Ti5O12-PAn) composite was prepared by in situ polymerization method using aniline,ammonium persulfate and hydrochloriearried as starting materials.Li4Ti5O12-PAn composite was characterized by XRD, IR combined with electrochemical tests.Results show that the electrical conductivity is enhanced obviously due to the introduction of PAn to Li4Ti5O12.Li4Ti5O12-PAn composite exhibits better high rate capability and cyclability than Li4Ti5O12.The composite can deliver a specific capacity of 191.3 and 148.9 mAh·g-1,only 0.13% and 0.61% of the capacity is lose after discharged for 80 times at 0.1C and 2.0C,respectively.