Abstract: A method is proposed to realize fast frequency estimation by using signal transform. This method can improve the speed of frequency estimation in digital receivers. Theoretical analyses on the principle, simulation results and the experiment on FPGA are given. The additions are applied instead of the multipliers in this method, so the time of calculating operation is shorter. The Standard Deviation of the method is analyzed and compared with the methods of Prony and FFT, The results show that the method and its performance is better tham other methods is feasible.