Abstract: Dissolutionof La in KCl-NaCl and LaCl_3-KCl-NaCl melts has been investigated by means of a transparent cell,cyclic voltammetry and EHMO of quantum chemistry.It is shown that the La dissolved in KCl-NaCl melt exists in a metallic state,the La dissolved in LaCl_3-KCl-NaCl melt can be ionized into La~(2+) as a result of reaction with La~(3+), furthermore,the La~(2+) reacts with La~(3+) forming atom cluster La_m~(n+) which is a stable state in the melt.

Key words: La, LaCl_3, dissolution, chloride Melt