Abstract: The structural and thermodynamical properties of Lennard-Jones melts were investigated by the molecular dynamical
simulation during heating and cooling process. Reduced potential increased with reduced temperature.The structure transition was found
at reduced temperature 0.51 during cooling. The atom configuration of the system was randomly arranged and the first peak of the pair distribution
function varied between 4 and 5 in the process of heating. The model system gradually evolved into a structure with the long range order in the process
of cooling as indicated by the data from the atom configuration and pair distribution function of the system.

Key words: melt structure, molecular dynamics, heating and cooling