In orderto study the visual effect of the external environment color on the information presented on Head-Up Display (HUD), a simulation system is developed to evaluate the performance of color scheme.At first, the IData software is used to model the flight navigation display interface, and the color character block of HUD is set up.Then, the HUD picture generated by the model is introduced into the simulated scene for flight simulation test.JSBSim model is used for flight operation data calculation.In the test process, different color of HUD character block is used for different visual scenes to inspect the simulated operating performance.The OSG visual simulation software package for high fidelity visual simulation development is used in the simulation system, thus the system development cycle and difficulty are reduced greatly.A number of pilot flight simulation tests show that:1) The displayed picture has no fluttering and no distortion; and 2) There is no obvious visual delay in the color changing process, which can meet the needs for test.