[en] Structure of liquid alkali halides, particularly alkali oxyacid salts, alkali fluoroberyllates and molten oxides are reviewed. A X-ray scattering strength was measured and standardized by the Krough-Moe-Norman's method, after the polarization factor, the absorption factor, the fluorescent X-ray, background and the Compton scattering were corrected. Attention should be paid to the correction of the incoherent scattering strength which depends upon the monochromator mosaic spread and the X-ray wave length. Four methods have been considered in order to determine N₁, number of the most closest atoms. However, the method of integration after the first peak is constructed so as to be symmetric on the D(r)/r curve is believed to be a reasonable method. Attention is directed to the first peak of the radius vector distribution function in which all calculated values are shorter as much as 0.1 - 0.4 A than the measured values. A theory must be developed by taking the deformation caused by asymmetric electrostatic field into consideration. Consideration of geometric arrangements between ions will be effective for the study of oxyacid salts. The more systematic study of molten beryllium fluorides may be significant, because their experiment can be performed by using nickel base materials. Analysis of molten silicates and the like are comparatively less, although they are important for geochemistry, metallurgy and glass industry. (Iwakiri, K.)