The effect and mechanism of smokescreen jamming on TV homing seekers were investigated by seeker captive flight jamming test,in which a TV homing seeker was hung up on an unmanned airship.The data of smokescreen jamming effect on the TV seeker in flight is obtained with the TV seeker disturbing by smokerscreen.The test results shows that smokescreen jamming has much effect on the tracking status of TV seekers,tracking error,measurement of line-of-sight angle and its angular rate.A rational explanation for the laws of smokescreen jamming effect is presented based on the principle of stabilization of seeker optical axis.