In conclusion, we introduced the relatively simple approach to investigate high-pressure melting of solids thanks to Lindemann's criterion of melting temperature and pressure-dependent Grüneisen parameter. Analytical expression of pressure-dependent melting temperature Tm has been proposed. Numerical calculations have been performed up to pressure 100 GPa for Cu and 350 GPa for ε-Fe metals. By comparing calculated results with those
of available experiments and theories we conclude that, Lindemann's criterion approach is suitable for evaluating the melting of Cu up to pressure about 60 GPa and 150 GPa for ε-Fe. This approach can also be easily applied to study pressure effects on melting temperatures of other metals such as Ni, Au, Al, … At higher pressure, Lindemann's criterion can just help us on qualitative investigation of high-pressure melting. It also can be used to verify future multi-anvil and DAC experiments as well as theoretical determinations.We suppose that it should consider about electron configuration of metals on study their pressure-dependent melting temperatures.