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In recent years, construction of urban space in China likes a ranging fire, which effectively improves urban habitats. However, serious problems appear incessantly among decisions, layout, designs, development and management of public space in China. In terms of urban common space in individual city, it exits quality decline, structure illegibility and regression of functions and artistic appearances, which are what we need to keep away and improve on. In this paper, we study the problem of multiple attribute decision making for evaluating the impact of mobile phone information technology on the urban public space development under the internet background in which the decision making information values are interval number, a new decision making method is proposed. Then, according to the concept of the cross entropy, the relative closeness degree is defined to determine the ranking order of all alternatives by calculating the cross entropy to both the interval positive-ideal solution (IPIS) and interval negative-ideal solution (INIS) simultaneously. At last, a numerical example for evaluating the impact of mobile phone information technology on the urban public space development under the internet background is provided to illustrate the proposed method. The result shows the approach is simple, effective and easy to calculate. [ABSTRACT FROM AUTHOR]