In view of the deep excavation and analysis of massive urban construction archives data, this paper expounds the background and significance of current research, and carries out the main contents, key technologies and prospect analysis of data excavation and analysis of urban construction archives. The excavation and analysis of urban construction archives, which is mainly based on analysis, correlation and integration of archival data, is able to establish a complete database of urban construction basic information, and to analyze data of users of urban construction archives. Through establishing a knowledge service engine, a flexible combination of networked information resources and intelligent information services, it can provide users with auxiliary decision-making services. There also can be a supporting system aiding spatial decision-makings, providing knowledge retrieval, statistical summarization, spatial model analysis, aided decision-making, thematic mapping, and other functions. In the future, the urban construction archives will develop towards management query automation, data resource integration and service networking, making better use of urban construction archives data for better decision support services.