In order to better monitor the deformation state of the bridge and evaluate the stability of bridge operation, GNSS (Global Navigation Satellite System) is used in bridge deformation monitoring, and singular spectrum analysis (SSA) is used to process the GNSS monitoring data. The determination method of embedding dimension and effective principal component of key parameters to real-ize SSA is studied. After SSA, the trend term and periodic term components in the deformation monitoring data are extracted, and the noise term is eliminated. The analysis of the results shows that the bridge will produce periodic deformation in three directions, and the deformation amplitude is different, but the period and deformation extreme points are consistent, and only change within a certain range. It is understood as the deformation caused by sunshine and load. This recoverable deformation also indicates that the bridge is in good operation condition.
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