Abstract: Aiming at the problem that the precision of frequency estimation is not enough in traditional engineering practice,an iterative frequency estimation method is proposed.The method has a quite effective function of weighted sample interpolation with the Fourier coefficient,and is applicable to almost all window functions.For a variety of window function system errors,this algorithm exhibited better performance than the traditional algorithm.Experimental results showed that this method was capable of significantly reducing the error caused location of the line.When the frequency estimation was performed under the conditions of Gaussian noise,this method obtained smaller estimation error than the traditional method,being impressed by higher estimation accuracy and anti-noise performance.