Kim, S.H. JACoW Publishing Geneva, Switzerland Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) has been officially provided to users from 2017. After the first user beam time, the PAL-XFEL beamline have proceeded with the development of a multiplexing experimental device as one of the specific coherent diffraction imaging science programs to secure global competitiveness. A multiplexing imaging device has been developed to enable small & wide-angle diffraction and X-ray emission spectroscopy experiments to be performed simultaneously in one chamber under a vacuum level of 10⁻⁴ to 10-5 torr. In addition, we adopted the Jungfrau 5M x-ray detector through a module arrangement suited to the purpose of our experiment. These developments also will be applied to the Korea’s Fourth-Generation Storage Ring (4GSR) beamline instruments.