The main issues that significantly contribute to problems and delays on construction sites are changing client's view, incomplete design information, and poor site monitoring and control. Although experienced designers and construction managers control or minimize such problems during the design stage, the complexity and amount of the information in construction project make such a task very difficult to accomplish effectively. This paper presents a conceptual model for an integrated system which aims at presenting construction activities in 3D using virtual reality. Firstly, the technology enables construction managers to walk-through the proposed building perhaps at different time intervals-giving a vivid appreciation of the whole situation. Secondly, its enables the users to interrogate the building elements to present its details progress thus giving total conceptual of the project.  Finally the system enables virtual models to be transmitted over the Internet and thus facilitates collaborative global design and construction. The development of the system embodies the intuitive responses, judgments and experience of experts in its knowledge-base. Virtual reality in this system was based on graphic world and has three basic characteristic: inclusive, interactive, and happens in real time. In other words, the user of virtual reality becomes parts of the virtual world where he/she can interact with and make real time changes.