The energy and structural changes of lithium microclusters based on temperature has been investigated by using Molecular-Dynamic simulation Method. Two and three-body interacted semi-empiric potential energy formula that characterized the interaction has been used. It has been calculated that the dissociation of atoms from cluster has started after 1300 K for Li-3 and 1350 K for Li-4, respectively. Dissociations at the fixed temperatures are very close to the expected values of the lithium metal. Additionally, it has been observed that Li-4 microclusters above 1000 K and Li-3 clusters above 700 K temperatures have steady structures in two different energy values. (C) 2003 Elsevier Inc. All rights reserved.