In this paper, we present the application of three- dimension (3D) monitoring for an un-manned aerial vehicle (UAV). The UAV system includes an unmanned helicopter and a station computer communicated with it. A 3D view is to be developed on ground station to realistically show the motion of the helicopter. To develop the 3D view, models of helicopter and virtual environment is developed offline. Drawing of 3D models is performed using OpenGL. Position and attitude of helicopter model are de-termined by data of helicopter state that is retrieved from onboard system in real time. In drawing process, value of state is applied to transformation matrices to perform translation and rotation of the helicopter model. To realistically show the motion of helicopter, 3D view is periodically updated ac-cording to received data. In this paper, we present the application of three-dimension (3D) monitoring for an un-manned aerial vehicle (UAV). The UAV system includes an unmanned helicopter and a station computer communicated with it. A 3D view is to developed To develop the 3D view, models of helicopter and virtual environment is developed offline. Drawing of 3D models is performed using OpenGL. Position and attitude of helicopter models are de-termined by data of helicopter state that is retrieved from onboard system in real time. To drawing the value of state is applied to transformation matrices to perform translation and rotation of the helicopter model. To realistically show the motion of helicopter, received data.