In order to study and diagnose the distribution, movement process and shape of the high-temperature plasma of pellet implosion in the Z-pinch implosion, a novel spherically bent crystal imaging system has been developed based on the Bragg diffraction theory. The key component of the imaging system is the spherically bent α-quartz crystal with the radius of 200 mm. An X-ray spectral imaging experiment using spherically bent α-quartz crystal has been carried out in the “Yang” accelerator in the Chinese Academy of Engineering Physics (CAEP). The X-ray film obtains the X-ray spectral information of Ti plasma. By analyzing the spectral information, the diagnostic result shows that the spectral resolution of the imaging system is 1092, which is consistent with theoretical value of the spectral resolution model. The imaging system meets the demand of spectral diagnosis.