In this paper a robust AGC architecture is brought forward to solve the stability problem caused by short-time pulse interference; at the same time, it make the uncontaminated data best quantized. According the short-time characteristic of pulse, a new algorithm based on multiple observation is put forward, which can blank pulse interference effectively. The new method is very simple and can be processed in real time. It is shown by simulation and test result, the new method in this paper has good performance and low complexity, which can be applied to receiver design.