Based on the empirical electron theory of solids and molecules (EET), the valence electron structure and bond energy values on each bond in tungsten crystals were calculated. Moreover, the bond network distribution of phase space and the relationship between bond energy and melting point were studied. The results show that the tungsten crystal has the higher hardness because the strongest bond (nA＝0.435 79) and the second strongest bond (nB＝0.085 62 )in W cell constitute a solid network structure. The metal W shows a higher melting point is attributed to the bond energy EA of the strongest bond is higher (113.865 87 kJ/mol).