Abstract: The size, shape and search strategy of field of view are important factors which impact the acquisition probability of infrared imaging seeker. The theory that seeker's field of view impacting acquisition probability was analyzed, and on the basis, the concept of search field and acquisition field were defined. After that, several types of field of view working models were established and compared, which had different shapes and search strategies. The simulation and calculation cases indicate that the area of acquisition field is not more than search field, and different shapes and search strategies achieve different sizes acquisition fields, which should be optimally selected according to design requirements. The involved research methods and conclusions provide theoretical references to the field of view selection and search strategy design for infrared imaging seeker.