In VOD system, allocating more bandwidths to broadcast hotter videos, the minimization of average client waiting time will be archived. But the hot degree of videos is changed dynamically. Now, there are only a few schemes with the capability of changing the bandwidth allocated to broadcast a video (also called channel transition) seamlessly and dynamically, such as SFB, SFB-With Preload, and SSB etc. But all of them are derived from Fast Broadcasting scheme, and have the same limit of low bandwidth utilization ratio. It can effectively improve the bandwidth utilization ratio that using lower channel bandwidth than video?s playing rate, such as Greedy Equal Bandwidth Broadcasting (GEBB) scheme and Poly-Harmonic Broadcasting (PHB) etc, but they do not change the bandwidth seamlessly and dynamically. Base on the characteristics, this paper proposed a new scheme, High Performance Seamless Channel Transition Video-Broadcasting scheme (HPSCT) with scalability and higher performance. Furthermore, with adoption of additional channels, the process of channel transition in HPSCT is transparent to clients and easier to be realized. The analysis of performance shows that HPSCT with scalability is more bandwidth-effective.