Abstract: In this paper, using the method of IERS protocol and DE405 ephemeris file, based on the CORS station and gravity station located in the Three Gorges area, the vertical crustal deformation and gravity changes in Three Gorges area from 2011 to June 2015 tide every 2 hours are calculated, and the spring tide tide influence distribution on December 14, 2012 is calculated. The results indicated that the solid tide in Three Gorges area has very strong periodicity,the long period of half month and half year, the short period of one day and half day.There are 2 times spring tide in Three Gorges area before and after the end of the per lunar month, the middle of a month and month at the end of the spring tide range is about 1/4; the annual winter (lunar declination 28 or 36, about November,December and January) and summer (about May,June and July, the solar altitude angle is close to the maximum tide) large tidal range, the spring and autumn small tidal range. High maximum tidal geodetic height 0.346 m and neap high -0.190 m (reference epoch 2000.0); solid tide on gravity and the vertical deformation of heterogeneous, a maximum of 110 μGal, minimum -200 μGal. Regional solid tide is obvious strip distribution, solid tide of vertical deformation and gravity changes influence the increase or decrease in the opposite direction. The research results of this paper can be for CORS, gravity stations of solid tide effect analysis,which provide a reference for related studies of the local solid tide.

Key words: Three Gorges area, solid tide, vertical deformation, Gravity solid tide