The study on the formulation and the influence factors to the property of copper-base IR interfering smoke agent as well as measurement results of the property are described. The results show that the smoke agent with excellent interfering capacity on mid-IR and far-IR, has better screening effect on visible lights and laser. Moreover, this smoke agent has some other characteristics i.e. large loading density,better insulation,better performance enduring high and low temperature,better compatible and stable performance.