This paper expounds the function of field data gathering and data processing of the integrated navigation system HYPACK in the siltation observation of Xuwei test channel for terrain monitoring process,processed raw-depth, selected depth in SBMAX, checked depth inspection checking and analysis-measuring precision, puts forward matters of attention and corresponding solutions, and describes the drafting of cross-section and scouring-siltation situation, so as to reflect directly waterway silting and scouring variation law.