Insb IR detectors array target is one of the most important equipments for diagnosis of mid-infrared laser beam quality.However,the temperature sensitivity of photoconductive Insb IR detector,which results in temperature drift of system′s quiescent point,decreases measurement accuracy.To solve this problem,a quiescent automatic capture system is developed.It realizes real-time adjustment when temperature varies.This paper provides an effective solution for the application of Insb IR detector in various conditions.