Performance of PC PbS IRFPA detector depends on bias voltage applied to PbS detector and working parameters of ROIC.Effects of working parameters,such as bias voltage applied to PbS detector,integration time and bias voltage applied to ROIC,on the performance of 1×128 linear PbS IRFPA detector with CTIA ROIC were investigated.Results show that signal,noise and detectivity of detector increase with bias voltage applied to PbS detector.The detectivity of detector reaches the maximum when bias voltage applied to PbS detector is 3 V.Increment of signal decreases while increment of noise increases after a critical bias voltage applied to PbS detector.The detectivity of detector reaches the maximum when integration time is 50 μs.Both signal and noise of detector decrease while bias voltage applied to ROIC increases in a range of 3.35~3.85 V.Meantime,the detectivety of detector keeps almost constant.The results are helpful to finding optimum working parameters.