Buffer/backfill materials may experience temperature change in several circumstances, and thus it is necessary to study the hydro mechanical behaviour of soils at different temperatures. The filter paper method is an indirect way to conduct the suction measurement. The filter method can cover the full range of suction measurement, and it is inexpensive and relatively simple. The calibration curves for Whatman No. 42 and Double-circle No. 203 filter papers are investigated at room temperature by many researc...