With the development of photoelectronics,micro-electronics and new material science,the quick development of infrared image seeker comes to front. In general, the infrared image seeker consists of two parts like infrared sensor and information processor. Based on analyzing home and oversea research status, the key techniques were discussed and analyzed. Finally,it was discussed the development trend of infrared image seeker technique according to the EKV technique of National Missile Defense System,and indicated the direction of infrared image detectability and information processing technique.