【Abstract】 Mixed anion compounds can generate the emergence of novel properties that differ from those with mono-type anion due to the difference of electronegativities, ionic radii, polarizabilities, and oxidation states between unlike anions. Abundant research has been conducted on metallic mixed-anion materials with potential application in electronics, detectors of moisture, gas sensors, electrodes for solar batteries, etc. The flux method has been widely applied for mixed-anion crystal growth, which based on metathetical reaction with appropriate metal-salts flux under mild conditions. It is meaningful to synthesize the mixed anion compounds by the flux method. Single crystals of tungsten oxychloride Li23CuW10O40Cl5 were prepared via CuCl2 flux-growth method by two steps, which using high quality and phase-pure polycrystalline Li4WO5 as precursor. The crystal structure was determined by single-crystal X-ray diffraction analysis, which indicates that Li23CuW10O40Cl5 crystallizes in P63/mcm space group（a= 1.02846（3） nm, c=1.98768（9） nm, V=1.82076（11） nm3, and Z=2）. There are crystallographically independent five Li, two W, one Cu, two Cl, and five O atoms in the unit cell, where W（1） atoms are coordinated with one Cl and five O atoms in a distorted octahedra geometry, while W（2） atoms are connected with four O atoms in a tetrahedral coordination. The Cu atoms are connected with six O atoms forming CuO6 octahedra. Thus, the crystal structure of the titled compound consists of CuO6 and W（1）O5Cl octahedra, and W（2）O4 tetrahedra. The successful synthesis of tungsten oxychloride Li23CuW10O40Cl5 through flux-growth method is meaningful for explore new mixed anion compounds in future.