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Water level change is the crucial disastrous factor of reservoir deformation.This paper derives the water level changes of reservoir based on GNSS-R technology by using the multi-GNSS deformation monitoring observation data of Xikeng dam in Shenzhen,and compares the results with the artificial observation data.The numerical results show that the root mean square error(RMS)of GPS-R results is 7 cm with the accuracy of BDS-R and GLONASS-R is slightly lower than GPS-R,and the range of RMS is 8-10 cm.