To fully utilize the character of the bioradar echo signal, autocorrelation analysis, spectral estimation methods and time-frequency analysis are presented in this paper. These methods are employed to deal with no one, single people and multi-people echo signal. Singular value decomposition (SVD) is used to extract feature vector for pattern identification. Single people and multi-people can be identified from the echo signal by the bioradar. Experimental results show that spectral estimation methods can improve the signal-noise ratio, and efficiently detect the signal’s frequency components. The method SVD based on Spectrum is stable and efficient to identify target information by bioradar.