Abstract: The cavern room circumstance of Huailai seismostation and its approaches and monitoring function are mainly introduced.The harmonic analysis results for the solid tide's horizontal component of tilt (SQ 70,FSQ) and strain (SSY Ⅱ) in Huailai seismostation are given.The harmonic analysis results for volumetric strain (TJ ⅠA) of some countrywide station are also given.Compared with the same kind domestic or abroad station,the accuracy of solid tide observation in Huailai seismostation has reached the advanced level in our country.