In Z-pinch experiments carried on Primary Test Stand(PTS),we used a multi-channel filtered X-ray diode(XRD)array to measure the soft X-ray total radiant energy,power and energy spectrum emitted from Z-pinches.This paper reports on the theory,performance and major parameters of multi-channel XRD array,and the unfolding calculation.The measurement results and the data analysis are also presented.At last,the spectra measured by multi-channel XRD array are compared with those by transmission grating spectrograp...