According to the Development Plan of Guanzhong - Tianshui Economic Zone, Xi`an will be built into a metropolis. This paper discusses systematically the reasons and the significance of Xi'an Metropolis, analyses deeply the positioning and the stage goal of Xi'an Metropolis. In the end, some valuable policy proposals are put forward to Xi'an Metropolis from eight aspects such as economic growth, urban construction, Foreign exchange, Soft Power of Culture , the Improvement of people's lives and low-carbon city.