The purpose of this study is to visualize the pedestrian flow with spacetime diagram model. In this model, the location of pedcstrian is shown on x-y plane and time is shown on Z-axis. The pedestrian behavior, which is hard to express with 2-dimentional model can be easily expressed with this model. In the computer, we construct a virtual 3D space and see the model rotating freely and interactively. We can understand the construction of pedestrian flow. We applied the model to a practical case and proved its properity.
