Li4Ti5O12/Li1.3Al0.3Ti1.7(PO4)3 composite was synthesized by sol-gel method. The structure, morphology and electrochemical performance of the composite were studied by X-ray diffractometry, scanning electron microscopy, galvanostatic charge-discharge test, cyclic voltammeter and electrochemical impedance spectroscopy techniques. Li4Ti5O12/Li1.3Al0.3Ti1.7(PO4)3 composite can be prepared by sol-gel technique and the particles of the composite are uniform. Compare with pure Li4Ti5O12, the Li4Ti5O12/Li1.3Al0.3Ti1.7(PO4)3 composite has lower Li insertion/extraction impedance. The specific capacity of the Li4Ti5O12/Li1.3Al0.3Ti1.7(PO4)3 composite doped with 1 wt%, 2 wt%, 3 wt%, 4 wt% and 5% wt% Li1.3Al0.3Ti1.7(PO4)3 is 6.2%, 11.8%, 15.5%, 8.0% and 2.0% higher than the pure Li4Ti5O12，respectively. The composite doped with 3 wt% Li1.3Al0.3Ti1.7(PO4)3 shows the best cycling performance of 0.022% capacity loss per cycle.