Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. Dams are interesting engineering structures, which have extraordinary importance for water management and also for people living in the surrounding area. For early detection of potential risks dams are subjected to permanent controlling. Geodetic measurements of displacement and deformation are the integral part of safety control. Currently, the complete automation of measurements is tended, as well as increasing their frequency. Despite the increasing simplifying of measurement process (the use of robotic total station or GNSS receivers) determination of absolute displacements requires the long-term process of measuring and computing. In order to provide the continuous monitoring of objects such as dams, relative methods (inclinometers, extensometers, etc.) can be applied. However, they do not provide the complete image of dam displacements .Quite recently, a new technology, ground-based microwave interferometry has appeared. It was developed for quasi-continuous measurement of object displacement with accuracy of ± 0.1 mm. An important feature of this system is the possibility of remote control of measurement and unnecessary access to the measured object in order to mount the sensors or measuring signals. During each data acquisition, which lasts a few minutes, the entire structure, which is within the radar range, is observed. Hence, we are not dealing with discrete (limited to points) measurement, but we obtain the continuous displacement map for the entire area of interest. Measurement can be performed regardless of weather conditions. However, like any novel technology, the radar interferometry must be tested for its reliability and accuracy, with reference to the methods currently used. The purpose of this study is to test the accuracy of IBIS-L (an interferometric radar) on the specially prepared test field and the test building which is the Poland's largest reinforced concrete dam in Solina. Thanks to the automatic system of sensors it is possible to compare results obtained from the inclinometers and feeler gauges with the IBIS-L results. Analysis of differences will enable verification of its usefulness in geodetic monitoring of displacements and deformations of the dam in Solina.