In many detection systems, the front-end electronics will receive the signals from detectors and handle them, but many detectors could give very large signals which will cause circuit saturation and waveform oscillation, this will lead to abnormal results of the whole electronics system. In this paper, according to a typical structure of front-end electronics, a kind of non-linear anti-saturation improvement method and circuit is introduced. And the simulation and experimental research show that the improvement solution is successful.