This paper begins with internal and external factors as well as field operating conditions during the monitoring process. According to the accuracy analysis which is done to several typical monitoring methods and the study which is done to the 360° reflecting prism test, the final choice is that total station polar coordinate would be used as the deformation monitoring method of Three Gorges Project ship lift tower during construction period, and deformation analysis is received using the long-term monitoring data obtained by the use of the method. The results show that tower deformation is greatly affected by temperature; the greater the temperature difference, the greater the deformation. It would be small deformation or even no deformation when temperature difference is small or under constant temperature.