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Modal analysis of structures depends on the accurate and swift collection of data from a vibrating structure so the data can be analyzed to determine the modal characteristics. With the development of computer vision techniques and high-speed camera techniques, vision measurement vibration is gradually attended by people. This paper researches a motion magnification technique based on computer vision, which can detect the small sub-pixel motion in vibration structure. And we use the new real-time motion magnification algorithm to identify mode of vibration structure, which can determine directly the modal characteristics without extracting displacements. Taking the cantilever beam as a model, and setting the accelerometer measurements and high-speed camera modal identification experimental systems for verification on the method we proposed is viable, and verifying the test results based on modal assurance criterion(MAC). The results demonstrate the method we researched can be applied to modal identification of vibration structure.