With the strategic positioning of Beijing as an international exchange center，Beijing municipal government has attached great importance to the construction of city image. How to effectively promote the external communication of Beijing’s city image has become a crucial issue in Beijing’s urban planning. However，in recent years，the spread of city image has become more difficult due to the dispersion of information reception. There are three major problems in the spread of Beijing’s city image：the dispersion of content，the indirect way of spread and the increase of negative voices. Based on the advantage of host diplomatic events，Beijing can make full use of the characteristics of the host diplomatic’s resources concentration，multiple channels and positive feedback to enhance the effectiveness of Beijing’s city image spread. Based on the analysis of the positive effect of home diplomacy on the image dissemination of Beijing city，it is an effective way to enhance the city’s image through the joint efforts of government’s overall coordination and multi-dimensional platform，broadening the multi-participation of stakeholders，creating a green ecological and cultural city landscape，setting up diplomatic issues with Beijing’s characteristics，also fighting for the discourse pouler.