The paper discusses a circuit to restrain the dc drift in high-gain dc coupling amplifier . The circuit is composed of a second order Bessel low-pass filter and an inverting summer circuit. The circuit described in the paper has been used in a high-gain （Av≥1000） dc coupling fast amplifier developed by ourselves. The output dc drift of the amplifier is very low. For example

an output dc drift of less than±3mV was found for an operation of a long period of 100 hours.