A hard X-ray imaging system with spherically bent crystal as transmission imaging device is proposed. Its basic structure is an isotropic X-ray point source and a Laue spherical transmission crystal. Different from the reflection configuration, it enables us to solve the problem in hard X-ray imaging with energy above 8 keV. In the imaging system, the X-ray is radiated by a small point source, is dispersed by a transmission grating placed in front of the spherically bent α-quartz crystal, is transmitted by the crystal, and finally is imaged on the detector surface behind the crystal. The imaging mechanism of spherical transmission crystal to obtain different magnification images is discussed, and the ray tracing program is used to design the transmission imaging system for simulation. The simulation results show that the proposed structure can achieve two-dimensional spatial resolution imaging. The backlight imaging experiment of X-ray tube with Cu target also proves that the experimental results are consistent with the theoretical analysis.