Abstract: Taking the BBVS-120 very broadband seismometer of Yixian seismic station as the research object, this article verified that the long-period component contained in the vertical seismic record is gravity tide. we extracted the tide information from the seismic record by wavelet transform method. Meanwhile, we analyzed the gravity tide information extracted from seismic record using Venedikov harmonic analysis. Our study show that the BBVS-120 very broadband seismometer of Yixian seismic station has the ability to record gravity tide.