In order to meet the needs of the system dynamic range and response time，this paper proposed a FPGA － based rapid IF automatic
gain control ( AGC) system． First，computer simulation is carryed out using Quartus II simulation to verify the timing and logic
functions of the system algorithm． And then the design and implementation of the system hardware are completed． Finally，the paper realizes
a control module inside the FPGA，up to 60 dB of dynamic range control． The validation of the logic simulation software and testing
of the hardware circuit proved that the response of the system is fast and has high control accuracy，and systems have achieved better
results in the actual radar receiver，and the proposed method increases the dynamic range of the receiver to improve the performance
of the radar system．