In recent years, as the number of mobile users increases sharply, the mobile communication industry rapidly develops, and mobile communication network equipments are added on a large scale; consequently, the transmission problem of mobile communication increasingly occurs, which creates bottlenecks in the development of mobile communications. How to effectively break through the yokes of energy efficiency and spectral efficiency is key to the development of the future 5G mobile communication network. On the other hand, with the emerging technology Software-Defined Networking in the Internet, this new type of network architecture changes the mode of traditional network control, thus, the mobile data transmission of Heterogeneous Multi-Networks is severely challenged. It is important to design a service-oriented Heterogeneous Multi-Networks collaborative architecture in the case of Heterogeneous Multi-Networks, and to create a cooperative transmission strategy according to user requirement, network resource state, and the differences in server capacity and time variations. This paper proposes a bandwidth evaluation mechanism based on the dynamic streaming protocol, where the network bandwidth is timely adjusted to provide users with uninterrupted viewing, and a streaming mechanism of video play with better Quality of Experience is provided in the same network bandwidth.