A kind of omnidirectional infrared characteristic modeling and verification technology are proposed for target systems under independent against conditions,in this paper. By fine 3D modelling,equivalent the main IR source to light source,a target drone IR infrared characteristic are modeled by emulation the IR radiation intensity at the observation surface of all viewing angles through the finite optical tracing method in optical simulation software. The IR characteristics of the target drone are tested on the ground. The experimental results are in good agreement with the simulation results,which verifies that the feasibility of modeling and simulation method,and could provide theoretical support for related research.in future.