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Research on delay in unsignalized intersection can improve the level of traffic regulations and management of intersections effectively. This article presents the process how delay happens in an unsignalized intersection and gives the investigation plan. Combined with survey results in Harbin, the relationship among traffic flow, traffic conflict, flow distribution, flow structure and the proportion of vehicles is studied. Then, the factors on the delay can be found through the change in scatter diagrams of investigation data. This research can provide the planners with an efficient analysis on the delay and provides a theoretical foundation for the calculation of delay in unsignalized intersection. [ABSTRACT FROM AUTHOR]