Through calculating the values of the atomic time average potential in the cluster and the analysis of the instantaneous structures, some new features of the melting processes are found in comparison to the high-symmetry cluster. The melting processes can be divided into several steps. The first stage involves the majority of the surface atoms (14atoms). The residual 4atoms remain in a quasi-solid. Then all the atoms in the surface of the cluster take part in the melting process, but there are two sites where the atoms stay for a relalively long time. The third stage corresponds to the frequent isomerizations involving all the surface atoms. Finally, all the atoms, including the inner atom of the cluster, begin an isomerization.