Abstract: A time-resolved crystal spectrometer has been fabricated for the study of X-ray radiations from Z-pinch plasma on Yang accelerator. In the spectrometer, an elliptical crystal is used as light splitting element, a ten-channel PIN array is employed to record time-resolved spectral images, and at the same time imaging plate(IP) is used to record time-integral results. The spectrometer has been used in Z-pinch experiments performed on Yang accelerator. The spectra of K-shell lines are observed, when using Al wire arrays as Z-pinch loads. Computer program ZSPEC based on the collisional-radiative model has been used to analyze the experimental data. According to the line ratios of H/He and I.C./He, the averaged space and time electron density, and time-resolved electron temperature are obtained.