Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. Building structures are extremely sensitive at influence of outdoor conditions. Most often are these the influence of wind, sunshine temperature changes of the surrounding and at least the influence of the own or improper (other) loading. According resonance the structure with the surrounding is coming to vibration and oscillation in relative high frequency interval (0.1-100.0 Hz). These phenomena significant way affect the static and dynamic characteristics of structures, their safety and functionality.The paper bring example of monitoring these phenomena using geodetic methods at two different types of structures. The first is the industry object of cylindrical shape, which monitoring was made by total station with measuring frequency ca 2 Hz. The second is the Danube Bridge Apollo in Bratislava (Slovakia), which steel structure was measured by total station, GNSS and acceleration sensors with frequency up to 10 Hz.The central point of the paper is the analysis of dynamic behaviour of both structures using spectral analysis method. The usage of Fast Fourier Transform is described, own frequencies and amplitudes of structure oscillation are calculated.