Composite materials fabricated by annealing of nonsuperconducting ceramics La 2 CuO 4 and La 1.56 Sr 0.44 CuO 4 at 910 °C during various time are investigated. Areas of superconducting La 1.85 Sr 0.15 CuO 4 phase arises at boundaries of contacting nonsuperconducting granules. The volume fraction of the superconducting phase increases with increasing annealing time. A model describing the magnetic and transport properties of the samples at low magnetic fields is constructed. The magnetotransport characteristics of obtained samples at low magnetic fields (∼ 100 Oe) are defined by weak links network formed by superconducting areas. At high fields, behavior of the system is defined by a magnetization of the disconnected superconducting islands. The average size of the superconducting areas has been estimated from an extended critical state model.