Objective Avirtual aircraftapplication system in brain computer interfaces (BCIs) based on Java3D is designed in this paper.Methods The results of the processed electroencephalogram (EEG) signals in BCIs are transmitted to the Java3D application system through the TCP/IP protocol.These results are then converted into real-time control commands to achieve the real-time control to the designed virtual aircraft flight.The application system can intuitively reflect and test the control effects of a BCI.The system design contains two steps.Firstly, a virtual scene is set up.Some models are built and the layout of the scenes is arranged.Secondly, the virtual aircraR is designed to move forward and rotate continuously.Results The application system can receive the analyzed results of EEG signals to direct continuous flight of a virtual aircraft in real time.Conclusions The results preliminarily verify the feasibility of Java3D application system and present a good foundation and direction for the design of BCI application system.