In the domain of urban planning,the“capitalization” of“big data” means the value of urban public affairs management and services.When big data is used in urban planning,it will not only provide high accuracy consultationand predictability for the decision-making,but also lead all industries to share the data bonus,and expand the breadth and depth of the sharing.During the process where urban planning enjoys the bonus of big data capitalization,the critical issue is how to explore the capitalization method based on the role orientation of urban planning among the tripartite confrontation relationship of data,thought and technology.In this paper, we propose that urban planning should become middleman for linking the spatial data,the data integration and other correlation technologies,the innovative thought, through analyzing the structure of the big data value chain about urban planning.Based on the role orientation, we further construct the big platform,which consists of big data acquisition,big data organization and big data integration.In consequence,the decision-making process of urban planning is changed, which includes selecting the paradigm between the causal reasoning and correlation thought,organizing the relevant data,integrating data into information,integrating information into knowledge,integrating knowledge into wisdom for decision-making.