The development of IoV in ITS is facing a series of challenging problems, such as the bottlenecks of heterogeneous network transmission capacity and high-efficient treatment of massive information. Aiming at such series of problem. This paper presents a reference model of hierarchical mobile cloud system. So that vehicles have preferential access to the corresponding levels of cloud services by its network environment and communication capabilities to achieve the best match between mobile network resources and cloud computing. Meanwhile, due to the rapid mobility of vehicle, the transmission of information in vehicular networks may be interrupted at any time which restricts the improvement of service in the vehicular networks business. It poses a significant challenge to the continuity of cloud services. This bottleneck is able to be improved through the VM live migration technology, so as to achieve Uninterruptible transmission of service.%智能交通车联网的发展面临着异构网络传输容量瓶颈、海量信息高效处理瓶颈等一系列具有挑战性的难题。针对该系列问题，本文提出一种层次化移动云系统参考模型，使车载移动终端根据其网络环境与通信能力择优接入相应层次的云服务，达到移动网络资源与云计算资源的最佳匹配。同时，由于车载单元的快速移动性，车联网中的信息传输随时可能中断，这就制约了车联网业务服务质量的提高，对云计算持续稳定的服务构成了很大的挑战，这一瓶颈问题可以通过虚拟机动态迁移技术得到改善，从而实现服务的不间断。
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