The invention discloses a video smooth control method, which enables recorded and broadcast teaching videos to have interactivity similar to live teaching and meets the requirements of online teaching. According to the invention, a plurality of audios, videos, images, animations and other files are synthesized into the long video with a plurality of timestamps, and meanwhile, the corresponding interaction rule is set for the long video, so that when a user watches the recorded and broadcast teaching video, the user can jump to the corresponding video clip for playing according to the interaction state of the user, the transition effect between the video clips is processed, the video connection violation feeling is reduced, and the effect of making false and true is achieved, so that the user can obtain the interaction feeling and experience feeling of live teaching through the recorded and broadcast video, the enthusiasm of the user for interactive questions and answers is improved, the thinking of the user is trained, and the synthesized long video can be downloaded to the terminal equipment of the user, so that the teaching quality is prevented from being influenced by network environment problems.