EAST (Experimental Advanced Superconducting Tokamak) real-time VOD (Video on Demand) system based on Web can display the plasma discharge videos, search videos, download videos and analyze videos frame by frame, which is improved and optimized based on the old VOD system. The system mainly includes two parts:the application of video synthesis and the VOD web station. The video synthesis application accepts shot information by using socket TCP communication firstly, then moves video frames through sharing directory, finally synthetizes videos with the tool of ffmpeg. The VOD system is implemented through B/S (Browser/Server) framework. It uses JSP to realize VOD function by reading shot information from database, and analyzes videos frame by frame by combining XML and JavaScript. The system has been already used in the EAST experiment, which is of great benefit to EAST experimenter.