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Research on VANET(Vehicular Ad hoc NETworks) is a hot topic, however, few papers focus on video transmission over VANET in verisimilar scenes and implementation of VANET terminals. In this paper we build three different traffic scenes(highway, regular city street and real traffic)of high fidelity, using network simulation software integrated with traffic simulation software. Experiments about transmission of constant bit rate data, MPEG and H.264 video have been carried out over VANET with different routing protocols. The network performance has been studied under different situations and various communication parameters. In addition, A new GPS and map based predictive routing protocol named GMPR has been proposed to improve VANET performance. Finally, we design and implement an embedded vehicle terminal based on Ad Hoc, which realizes functions such as Ad Hoc wireless communication, GPS positioning, map viewing, video capturing, audio and video playing and gaming etc. Our work in this paper is of great reference value for VANET applications.