According to the changes of XPS, IR and lattice constants in bismuth (lead) system superconductor, the location of F substitution in O(2) has been determined. The Tc0 in fluorme doped bismuth (lead) system superconductor can be inproved greatly with the formation of Pb-F and Cu-F, the strengthening of coherence between Cu-O and Bi-O plane, and the increasing of chemical pressure and the density of electronic states.