Abstract: The actuality of Yixian Seismostation and its digitalized reconstruction for crustal deformation obser-vation are introduced.The digital and analogue data of crustal deformation are compared in the field of long term and short term tendency, earth tide, and so on.Through comparison on the continuity, stability, consistency and tidal precision of the two kind data, a general evaluation on digital data is given, and some proposals are also presented.