In the process of obtaining video，many factors lead to the degradation of the video quality，and lower the spatial resolution of video；on the other hand，the exposure time and the frame rate of camera limit the time resolution of video. Video super-resolution reconstruction is an effective way to improve the temporal resolution and the spatial resolution of video，which has aroused wide concern in computer vision and image processing fields. In this paper，the concept of video super-resolution is described and the development phases in recent years are reviewed. In addition，some of the key technologies are analyzed. Furthermore，the challenges in this field are pointed out. Finally，the application of video super- reconstruction technology is prospected.