It was reported in 1995 that there were more than 150 major cities in the world where subsidence were substantial (Barends et al.,1995,1998).Because of the wide distribution of land subsidence and its severe consequence to environment and economy, land subsidence has been one of the topics needing research and technology transfer at the international level. It was reported in 1995 that there were more than 150 major cities in the world where subsidence were substantial (Barends et al., 1995, 1998). Because of the wide distribution of land subsidence and its severe consequence to environment and economy, land subsidence has been one of the topics needing research and technology transfer at the international level