Simulation of IR detector noise is a difficult point in engineering development of 3D dynamic IR scene simulation.A dynamical generating technology of IR detector noise is provided.Firstly,by computing and analyzing the image sequence of IR detector,the random Gauss noise and salt pepper noise are extracted.In simulated scene based on OSG,a noise “screen” is attached to the view of the simulation scene by technology of render to texture(RTT).Then,to realize the dynamic effect,the random Gauss noise is generated and rendered by shader.The salt and pepper noise is directly rendered in shader according to the sign of blind pixels in RTT texture.According to the results,the effect of the noise simulated by this method is lifelike,and the system cost is little.The method provides a practical engineering reference for developing a dynamic 3D IR scene.