1. The double piezometer is made of organic glasses and rubber membranes. It can not only directly shows the interior pressure in liquid, but also can be used in the buoyancy force related experiments.

2. By means of olivine thermometer and piezometer measurement, the lithogeneous temperature-pressure condition for major sulfide-bearing lithofacies of Jinchuan intrusion has been calculated.

3. Based on the analyses of hydrological conditions and piezometer response patterns around the reservoir, the mechanism of the sinkholes and the tendency of their development are involved in the paper.

4. For best results in measuring static pressure, a piezometer ring should be used.

5. The measurement of pressure was carried out by using semiconductor silicon piezometer. With the static pressure in inlet of pipeline and theoretic analysis we could get the total pressure of MPT.

6. The authors think that it is untenable for restraining the application of slotted-pipe piezometer by dam height and delay reaction ruled in the technical specification for fill-dam monitoring.