Using magnetron sputtering method,ITO thin films were successfully deposited on glass with target at a mixed atmosphere of Ar and O_2.The effect of sputtering process parameters on electro - optical characteristics of ITO thin films was discussed using UV - visible - infrared spectrophotometer and four - probe.The experimental results show that when the target angle is 23~25 degrees,the oxygen flow rate is 7~9sccm,sputtering time is 60~90 min and the sputtering power is 100~120W,transmittance of ITO thin films is more than 90%,and sheet resistance ranges from 10~20Ω/□.