Tin/TiO2 composites prepared by chemical treatment and calcination were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), cyclic voltammetry, electrochemical impedance spectroscopy, and half-cell tests. The SEM and XRD results show that Sn modified on TiO2 surface after 450℃ calcinations can form (SnTi)O2 solid solution. The electrochemical test results show that Sn modified on TiO2 can reduce the irreversible capacity in the first cycle. The (Ti+Sn)O2 composite has high reversible capacity around 350mAh g^(-1). After 50 discharging/charging cycles, the reversible capacity is around 250mAh g^(-1).