Using the IR imaging system to observe the target, especially Strong thermal radiation target, dynamic range is not enough. In this paper, a dynamic range adjust technology based on self-adaptive to scene characteristic is proposed. This paper describes a method of imaging super-resolution by adjusting the ranges of imaging signals on infrared focal plane array in details. This method includes three steps. The first step is to extract the gray characteristic of the scene needed observing, analyze the gray characteristic of the target, and get the adjust witness for dynamic range adjusting. The second step is to combine with the adaptive filtering algorithm based on LMS, and give the adjusting parameters after filtering on adjust witness. The third step is to complete the dynamic range adaptive adjust on imaging of infrared focal plane array imaging system by using electrical level value to adjust bias voltage. The total scheme is validated in many experiments using the infrared focal plane array imaging system developed by ourselves. The feasibility of this method is proved during experimentsand the quality of imaging is improved evidently.