Abstract: InGaAs near-infared camera has quantum effeciency and neghgibie dark current in effective working wave length range.It has the charateristics of working at room temperature and thermoelectic cooling system.In view of the large data information quantity,and high frame rate small target extract of large array InGaAs near-infared camera,combining with the corresponding detector array,a schence of opening window function is proposed based on the integer structure and hardware realization.The function is verified in experiment,and it solves the problem of high frame rate small target extract.