Abstract: Laser fuze works in the near-infrared band. Due to its advantages of strong ability of resisting electromagnetic interference, high ranging accuracy and good directivity, near-infrared laser fuze has been widely used as an important type of fuze system. Obtaining the scattering characteristics of the target by analyzing the changes of the infrared light field plays an important role in improving the performance of the infrared fuze. Based on this, a novel dual frequency infrared laser fuze system was proposed. The theoretical calculation of the scattering properties of the infrared light field with different targets and analysis of the physical factors that affect the scattering phase function were carried out. The results show that when the particle size is smaller than the infrared laser wavelength, the scattered light is mainly backscattered. When the particle size is larger than the infrared laser wavelength, the main scattering light is mainly forward scattering. Therefore, a new identification method for different targets was proposed and proved the feasibility and practicability of this method.