The invention discloses a method for 
system for monitoring multi-dimensional deformations of electric transmission lines in real time on the basis of differential positioning. According to the methodand 
system, a 
base station is electrified to carry out measurement or increase 
measurement frequency, 
longitude and 
latitude information of the 
base station is updated in real time by utilizing a known 
base station coordinate, and a measured 
carrier phase observed value, a measured pseudo-range observed value and the base 
station coordinate are transmitted to a background 
server through a 4
G network in an RTCM format or a self-defined format; a monitoring 
station uploads acquired field state data and a command for 
processing a 
client to the background through the 4
G network in the RTCM formator the self-defined format; the background 
server receives the information sent by the base 
station and the monitoring station and carries out single-
system and multi-system combined calculation; andthe background 
server converts the three-dimensional position of the base station into a 
longitude, a 
latitude and an altitude so as to obtain the position information, relative to the base station, of the monitoring station to complete the real-time monitoring. The method and system can be used for monitoring the multi-dimensional postures of electric 
transmission line towers on complicated geologies so as to ensure the 
safe operation of the electric transmission lines.