Abstract: The layered charges were calculated by means of constructing the complete structure of Tl-Ba-Ca-Cu-O superconductor. The weak link between Cu-O and Ba-O, or between Cu-O and Tl-O or Ba-O or Tl-O layers is explained with the aid of the charge of limited layer unit calculated from the values of ions obtained, in addition to the possibility of forming charges fluctuation, which depends on the π coordination covalent bond on Cu-O plane and O-Tl-O structure. The possible chemical tight bonding orbitals are in accordance with those of other superconductors obtained by quantum theoretical method, which occur at Cu_3d(x²-y²) and O_2px,y. The valence band composed of Cu 3_3d and O_2p orbital energy levels is obviously an energy band of conduction. The ordered charge on layers is the main reason that raises T_C of superconductors. The difference of electronic structure of ab plane and c axis leads to the anisotropy properties.

Key words: Superconductor, Ordered charge, Completing structure, Exchange and correlation potential, Layer