Based on the working principle of millimeter wave radiometer of the terminal sensitive projectile, the smoke screen jamming mechanism and the testing principle and method of interference material emissivity are analyzed and studied. The high emissivity material is dynamically placed above the small iron plate, and the radiation signal of the small iron plate weakens sharply. Testing results show that it is feasible to use the smoke screen formed by the high emissivity interference material to jam millimeter wave radiometer.