It discusses how to create urban public art space in urban construction. Taking the most important and the most intuitive public space art of city culture and city image as carrier， from the perspective of the relationship between city culture and public space art， the expansion of modern city public art space is clarified. It puts forward how to build the city cultural image in the city construction， to shape the city brand with vitality， to highlight the city cultural personality， to enhance the influence of city， to improve the city competitiveness， to make city more of a spiritual home rather than a simple living place.