A system VirTree has been designed for visualization of ultrametric phylogenetic trees, which creates a three dimensional view and also provides a virtual reality presentation. The system can validate clusters in tree and adding a new dimension gives advantage to visualize each cluster independently. In addition to customization of 2D & 3D displays, a virtual reality presentation is provided in system through Viewlang. Viewlang is a web environment of three-dimensional visualization that has a high development speed due to QML language. The virtual reality can dramatically increase the information content of visualization and provides a wide range of view to see the general picture of tree with details while due to limited size of monitor screen this is not possible for large trees.