This paper gives a new and better method for quality frequency estimation of single complex sinusoid. The method meaning: decompose autocorrelation matrix of signal in eigen value first to find the biggest eigen value, then reorder a new non-symmetrical correlation matrix according to a certain rule,decompose it in singular value select the smallest vector of singular value and directly estimate frequency by means of the computation formula similar to the Pisarenko method. The simulations experiments show that the new method is of high resolution and high statistical stability in lower SNR and shorter data as compared with the MUSIC method.