  X-ray fluorescence remote sensing technique plays a significant role in the
chemical compositions research of the Moon. Here we describe the data analysis
method for China's Chang'E-2 X-ray spectrometer (CE2XRS) in detail and present
the preliminary results: the first global Mg/Si and Al/Si maps on the lunar
surface. Our results show that the distributions of Mg/Si and Al/Si correlate
well with the terrains of the Moon. The higher Mg/Si ratio corresponding to the
mare regions while the lower value corresponding to the highland terrains. The
map of Al/Si ratio shows a reverse relationship with the map of Mg/Si ratio.
