Abstract:The object of this paper is the borehole tilt and the component strain aided observation pressure data of the Balguntay; Influence of pressure on the borehole tilt is studied by correlation and wavelet analysis. The result shows: (1) The influence of pressure on the Balguntay of the borehole tilt is a quasi linear relationship; (2) The influence of the pressure on the Balguntay of the borehole tilt on the NS direction is larger than that of the EW direction; (3) The significant frequency band of pressure to NS is 2 048~8 192, 32 768~65 536 min; (4) the significant frequency band of pressure to EW is 2 048~8 192 min. The mechanism of the effect of the air pressure on the borehole tilt of Balguntay is also discussed.