The perception module system of the virtual human in dangerous circumstances is studied mainly. The decision-making model based on emotion is created with mathematical method. The visual perception method is designed with geometrical algorithm, which can realize the determination of objects’ visibility. Perception module is designed with object-oriented method, including environment-information notification and virtual human’s responser. Communication between virtual human and nearby objects is communicated based on the perception module. The platform, which can simulate virtual human behaviors, is created with OpenGL technology by Visual C++6.0. The simulation results of virtual human behaviors prove that the perception system design of the virtual human is feasible.