Kim, C. Hong, J.H. Kang, H.-S. Ko, I.S. Lee, S.J. Shin, D.C. JACoW Geneva, Switzerland 978-3-95450-192-2 10.18429/JACoW-IBIC2017-TUPCF26 English 274-277 TUPCF26 ion electron linac FEL electronics Contribution to a conference proceedings 2018 2018-03 https://doi.org/10.18429/JACoW-IBIC2017-TUPCF26 http://jacow.org/ibic2017/papers/tupcf26.pdf The X-ray Free Electron Laser of the Pohang Accelerator Laboratory (PAL-XFEL) will produce 0.1 nm wavelength X-ray with a femtosecond order pulse width by using the self-amplification of spontaneous emission (SASE). For the successful commissioning and the stable operation of the PAL-XFEL, Beam Position Monitors (BPMs) are most important instruments among the various kinds of electron diagnostic tools. In this work, the BPM system for the PAL-XFEL is described. From the pickup to the operation status, details of the BPMs are presented.