This paper introduces a full section monitoring of land subsidence borehole using distributed fiber optic sensing(DFOS)techniques, which can obtain data on multi-fields and multi-parameters and provide delicate monitoring of land subsidence. The concept of full section monitoring of borehole using DFOS is firstly introduced. The key techniques on the application of this method include the selections of cables and sensors, the backfill materials, the coupling of cables and soils and the installation of cables and sensors in boreholes. A system frame of the full section monitoring of borehole with DFOS is built. Finally, the whole process of full section monitoring with DFOS and its features are illustrated with a case in Shengze Town, Suzhou.