Point-surface composite infrared decoy is one of the advanced infrared jamming equipment used in aircraft platforms at home and abroad, which has a good capability against infrared guided missiles. For aircraft platforms, it is important to master the use strategy of point-surface composite infrared decoy. It determines the aircraft’s survivability during terminal defense. Currently, the use of infrared decoy lacks simulation analysis support, and there is a certain degree of blindness. With the improvement of couter-coutermeasure ability of infrared guided missiles, it brings higher requirements for the development and use of infrared decoy. Besides, there is a lack of simulation and research related to point-surface composite infrared decoy. So the airborne dynamic dispersion characteristics and application of point-surface composite infrared decoy is studied.To obtain the dynamic walk characteristics of point-surface infrared decoy in the air, theoretical basis for its use is provided, and the effectiveness of point-surface infrared decoy is improved, dynamic and kinematic analysis of point source decoy and surface source decoy of point-surface infrared decoy (Fig.3) is performed, the simultaneous equations are solved, so the trajectory of point source decoy and dispersion of surface source decoy in the air were obtained. Then by changing the aircraft platform speed, the relative motion trend of the point source decoy and surface source decoy, and the influence law of the platform speed are obtained. Based on the simulation of airborne dynamic dispersion characteristics of point-surface infrared decoy, the use research is conducted, and the jamming characteristics and mechanism of the point-surface infrared decoy are described. Jamming characteristics mainly include radiation intensity value, rate of radiation intensity change and radiation area. The formation characteristics of point-surface infrared decoy in the field of view of infrared guided missiles are analyzed. And based on this, the mechanism research is carried out.Through simulation analysis, airborne dynamic dispersion characteristics are acquired (Fig.6). It provides a good foundation for the use of point-surface composite infrared decoy. At the same time, the infrared radiation characteristics of point-surface composite infrared decoy are acquired (Fig.9). For infrared guidance seeker, it is sensitive for radiation intensity change rate (Fig.10) and radiation area (Fig.11) of infrared decoy. The jamming mechanism of the point-surface infrared decoy in the imaging phase (Fig.13) and the non-imaging phase (Fig.12) of the infrared guided missile is analyzed, which can provide reference for the formulation of decoy use strategy and improve the battlefield survivability of aircraft platforms.In this study, starting from the basic physical laws, the dynamic dispersion characteristics of point surface composite infrared decoys in the air are studied, and the impact of platform speed on the dynamic dispersion of point-surface composite infrared decoys in the air is simulated. The results show that the faster the platform speed is, the smaller the relative separation speed of point-surface composite infrared decoy relative to area source decoys is, and the greater the diffusion speed of area source decoys is. The interference characteristics and mechanism of point-surface composite infrared decoy during use are analyzed. Its key characteristics such as radiation intensity value, radiation intensity change rate, and radiation area have the ability to interfere with infrared guided missiles. The interference mechanism of point-surface composite infrared decoy in the imaging and non-imaging stages of infrared imaging guided missiles is described, and the confrontation process is described based on simulation results. The research on the dynamic dispersion characteristics simulation and use of point-surface composite infrared decoy in the air conducted in this paper is mainly based on the characteristics of the decoy itself and the basic interference principles. The actual use strategy should be comprehensively studied and determined in combination with multiple factors such as missiles, aircraft targets, and maneuver strategies.