Land subsidence may lead to riverine or coastal floods and decline bearing capacity of soil. Precise leveling surveys and monitoring well settings are the common methods for land subsidence monitoring. However these surveying methods are point based observations which are hard to show regional elevation changes. This study is intent to obtain regional elevation changes by using multi-temporal aerial images. Combined with GPS and previous elevation surveying data, the exterior orientation of the images were solved the bundle adjustment of aerial triangulation. In order to reduce the effects of buildings, vegetations and other ground objects, a filter was applied to obtain DEMs, which are suitable to derive the elevation changes in this region. Historical regional elevation changes can be derived by using multi-temporal DEMs obtained from the aerial images acquired in past.