Abstract: In order to obtain high energy resolution and high collimation synchrotron radiation light, a channel-cut type single-crystal silicon (111) monochromator with two times diffraction was designed based on the optical parameters of small-angle scattering station in SSRF (Shanghai Synchrotron Radiation Facility). X-ray diffraction dynamics was used to analyze the optical properties of the monochromator. The parallelism, asymmetrical angle and rocking curve were measured, and the error of rocking curve was analyzed based on test value. By comparing the analog value with experimental measurement, the results show that reducing the residual stress in the process which causes the lattice damage, improving the quality of crystal morphology, adjusting asymmetrical angle, and increasing the number of diffraction, can make the intrinsic diffraction width of crystal narrower, and as a result, higher resolution and more collimated synchrotron radiation. All of the results prove that the channel-cut type monochromator made of single-crystal silicon (111) has an intrinsic energy resolution of 1.452×10^-4 at 10 keV.