Abstract:We use the Venedikov harmonic analysis method to calculate the tidal factor of solid tide of the EW and NS components of the ground tilting observatory station on the Taihang mountain piedmont fault zone from 2002 to 2017. Further, the time series of three characteristic quantities (expansion, shear strain, anisotropy of the medium) of the tidal factor Δγ anomaly and dynamic combination are obtained. The relationship between the three dynamic combination features and the moderate earthquake near the Taihang mountain piedmont fault zone is analyzed. The results show: 1) Tilting factors are less affected by the ocean tide load, and do not show obvious regular changes caused by the change of latitude. The variation of tidal factors may be affected by the change of lateral inhomogeneity of the crust. 2) The dynamic combination feature of the tidal factor has a good correspondence with the ML4.0 earthquakes in the range of 350 km around the observation stations.