摘要：Nowadays, urban design faces complex demands. It has become a necessity to negotiate between stakeholder objectives, the expectations of citizens and the demands of planning. It is desirable to involve the stakeholders and citizens from an early stage in the planning process to enable their different viewpoints to be successfully expressed and comprehended. Therefore, the basic aim of the study was how the MR （mixed reality） application is designed to encourage and improve communication on urban design among stakeholders and citizens？ In this paper, we discuss new approaches to visualize urban building and environment alternatives to different stakeholders and provide them with tools to explore different approaches to urban planning in order to support citizen＇s participation in urban planning with augmented and mixed reality. The major finding of the study is that learning ＂how these participatory technologies may help build a community of practice around an urban project＂. And throughout the different experiences, we can learn to assist towards development of a methodology to use the mixed reality as a simulation tool in the enhancement of collaborative interaction in real-egyptian project. So, we can determine a number of recommendations to deal with new participatory design tools for urban planning projects.