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With the development of China’s economic strength, more and more monitoring equipments are used to monitor predestrians in many public places. The Facial recognition is and will be further important aspect in this field. In order to reduce the spatial proportion of video data, most of the current market uses low-resolution storage to store video data, which has a great impact on the recognition rate of human faces. the method can improve the face recognition effect under the environment of low resolution.complete the number of accurate, fast, low cost of statistical work, no matter in the field of business and security areas, will bring infinite space.Therefore, based on the previous work, this paper makes a more targeted description based on the development of the field in recent years.In this paper, some hot methods are introduced in detail, and it is hoped that the relevant researchers can give play to their greater value on this basis.