As a new type of opto-electric countermeasure weapon, the laser weapon is being taken more seriously. But as a jamming weapon in the infrared waveband, it is rarely reported at present. In this paper, the tracking system of an infrared imaging guided weapon and its core device, a silicon CCD are used as the objects of study. The principle of infrared imaging guidance is summarized and three approaches to jamming the infrared imaging guidance system by using a laser are proposed. Jamming experiment is made on the infrared imaging detector and tracking system by using a 10.6um laser as the jamming source. The images displaying jamming effectiveness are given and the factors which have influence on the jamming effectiveness are analyzed.