Cloud computing has become a hot topic as the symbol of the 3rd IT revolution. Currently, the general cloud computing architecture requires intensive data and computing center that require massive hardware investment and high speed network access. However, the current network infrastructure in China may not meet the requirement, while the over-heated construction of cloud centers may also have caused waste of existing PC hardware. Base on that, a dynamic user integrated cloud computing architecture is proposed that integrates user resources into the cloud center while providing cloud services. This paper propose a video on demand system based on the proposed architecture. Preliminary tests show that the system can be expanded while keeping the service quality.