Abstract: Speckle makes High Resolution Range Profile (HRRP) fluctuate largely within the frame without scatterer Moving Through Range Cell (MTRC). This paper makes use of the matching score to measure the speckles influence on the spectra features of HRRP, such as the amplitude spectra, power spectra and higher order spectra. Then, the results are analyzed to obtain some conclusions for the selection of spectra features. The Monte Carlo experiments and measured data from an anechoic chamber indicate that the speckle makes spectra features of HRRP fluctuate according to the energy ratio of the speckled scatterers and the speckled segment. Meanwhile, the fluctuation of higher order spectra caused by the speckle also depends on the order. In the common spectra features of HRRP, power spectra are the most insensitive to the speckle.