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Deep underground is more beneficial to earthquake observation than surface because it is characterized with low ambient noise. We install a collocated observation station of translations and rotations in HDUL (Huainan Deep Underground Lab, 848 meters underground), insisting of three broadband seismometers and a fiber-optic rotational seismometer. The station captured a M6.1 teleseism occurred at Hualien. As the vertical rotational rate is linearly related to the transverse acceleration, we estimated the back azimuth of the earthquake and phase velocity dispersion curve of Love wave through rotational method, and analysed the underlying influencing factors that affect the estimated values.