Anthropogenic ground subsidence due to massive pumping of groundwater is one of severe environmental hazards in Taiwan. The Yunlin County located in the southwestern coastal region of Taiwan is one of the most counties with serious land subsidence because of the agricultural needs. In certain areas of the region, the subsidence rate reaches as much as 14.3 cm/yr. The severe land subsidence gives rise to the risk of flood hazard and endangers the operation of Taiwan High Speed Rail (THSR). Here, we represented a Persistent Scatterer InSAR (PSInSAR) results deduced from 1996-1999 time spans for monitoring of land subsidence in this area. The PSInSAR results show the Baojhou, Tuku Township and Yuanchung reveal a maximum subsidence rate of about 6.14 cm/yr along LOS and the Lunbei Township located on the northern Yunlin reveals a subsidence rate of 4.19 cm/yr relatively to You-Che Elementary School in Erhlun, which is quite coincident with precise leveling result. This result has proven that the effective reduction of labor and cost could be achieved by using this technique on monitoring land subsidence in Yunlin County.