Abstract: In this paper, a set of methods is outlined for processing original data recorded by Bore-hole strainmeter.As an example, the data observed at Luanxian Station, Hebei province, have been processed and the tidal analysis has been made in different steps.It has been proved that all the steps are effective,and, the final results of tidal analysis are better than that in other steps.The advantages of the methods have showed that the observational data can be fully utilized, and that the correction of nonlinear vari-able grid-vale, the frequency spectrum analysis in different bands, the correlation analysis of atmo-spheric pressure and its correction are linked together as a whole procedure which has continuity, sys-tematicness and universality.