The capacitor feedback trans impedance amplifier (CTIA) structure is widely used in small signal processing readout integrated circuit (ROIC) design due to its high injection efficiency and linearity.However,using this structure as the input stage time delayed integration (TDI) linear readout circuit,when the processing signal is large enough,the output voltage levels are different between neighboring frames,up to 2 V.In the image,the light and dark stripes appear alternately,which cannot be detected normally.The smaller the integrated capacitance,the easier the phenomenon appeared.Moreover,this phenomenon is not significantly improved by improving the capacity of power supply,changing values of bias and reference voltages.In view of this phenomenon,through in depth simulation and theoretical analysis,the problem is finally located,and the solution to effectively eliminate the phenomenon is put forward.