Abstract：The curved crystal X-ray technique has been developed for near a hundred years, and it has become one of major research directions in X-ray fluorescence spectrometry (XRF) so far. It was started in the crystal X-ray diffraction technique. Generations of scholars promoted the advances in curved crystal X-ray technology from conceptual design to theoretical derivation. It was succeeded in the maturity of processing technic for artificial crystal and curved crystal, including flat crystal, cylindrical crystal, doubly curved crystal and fully focused curved crystal. It was extended in the application of microprobe analysis, laboratory energy spectrum instrument and clinical imaging,etc.Doubly curved fully focused crystal could monochromatize and focus the X-ray which was irradiated on the crystal, obeying Bragg Law and Loran circle structure. The curved crystal X-ray technology and instrument performance were improved essentially. The paper reviewed the development and application history of curved crystal X-ray technology and instrument. The valuable experience of predecessors in development of crystal and instruments was pursued. The development direction of curved crystal X-ray instruments in future was explored.
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