In this paper, a new experimental technique-rotating aperture method of speckle photography for dynamic problem is proposed. The displacement field of any moment of a specimen can be obtained, while simple equipment is needed. Using a rotation device, the whole dynamic process can be recorded on a single specklegram, and then information of every moment can be separated from each other easily by whole-field filtering. This method is applicable not only to vibration problems, but also to non-periodic dynamic problems. Three experiments have been, carried out for demonstration. Speckle fringes are olear and reliable. Quantitative analysis of experiments agree well with the results obtained from other methods.