Based on the characteristic of the fiber grating wavelength absolute encoding, the vertical sensing measurements of the stress, displacement have been realized by means of the improving the structure design of the free end of the cantilever beam.

The paper has reviewed processing techniques of wave impedance and forming of absolute wave impedance section which directly apply to geological interpretation, and indicated that if have no logging data in the surveying area, may be obtained relative wave impedance section with seismic channel integral technique which also favourable to geological interpretation.