It is the purpose of studying chaff and foil mixed on three millimeter waves (MMW) for enhancing jamming efficiency. Jamming feasibility of chaff and foil mixed on three MMW terminal guidance weapon is analyzed, the typical dissertates on aerodynamic characteristic, time domain characteristic, Doppler effect characteristic of chaff and foil, it presents a modeling and simulation method of three MMW chaff and foil echo of generation, the simulation results is valid.