The single crystals (M2Cu2O3)(m)(CuO2)(n) (M = Ca, Sr,Y,B) containing the l
adder-type plane Cu2O3 were obtained by the flux method using Bi- and Ba-cu
prates as fluxes. The single crystals with m/n-values 5/7 and 1/1 were foun
d to be superconducting (SC) with the onset of the transition at 80 Ii. The
regularities of the SC crystals with the ladder-type structure were discus
sed from the viewpoint of the crystal chemistry.