Method, device and system for reducing peak video-on-demand CDN bandwidth

The invention discloses a method, a device and a system for reducing a video on demand CDN bandwidth in a peak period. The method comprises the following steps: collecting terminal equipment parameters and historical CDN bandwidth data of terminal equipment; calculating the minimum video definition and the corresponding code rate of the corresponding terminal equipment according to the terminal equipment parameters; predicting the future peak time period of the corresponding terminal equipment according to the historical CDN bandwidth data, and forming a peak time period prediction list; according to the peak time period prediction list, judging whether the current playing time is before, during or after the peak; and respectively issuing different broadcast control strategies and video sources with different code rates to the terminal equipment before, during and after the peak. According to the invention, on the premise that the watching experience of a user is not influenced, different playing control stra