Molecular dynamics simulations of molten (La 1/3 , K)Cl at 1123 K have been performed in order to investigate the correlation between simulated dynamical properties such as the self-exchange velocity (ν), the self-diffusion coefficient (D) and the electrical conductivity (κ) and the corresponding experimental values. The simulated results revealed that v and D of potassium decrease with increasing mole fraction of lanthanum, as expected from the experimental internal cation mobilities, b. The decrease of b K , ν K and D K is ascribed to the tranquilization effect by La 3+ , which strongly interacts with Cl − . In contrast, b La , ν La , and D La increase with increasing concentration of La 3+ . The distorted linkage of the network structure of [LaCl 6 ] 3− units was disconnected with increasing the concentration of the alkali chloride. This might be attributed to the stronger association of La 3+ with Cl − due to the enhanced charge asymmetry of the two cations neighboring Cl − . The sequence of the calculated v’s, D’s, and κ’s is consistent with those of the referred experimental results.