In order to improve the seismic capacity of the aerated concrete infill walls, the mechanical properties of aerated concrete block and low cyclic horizontal force experiment of aerated concrete infill walls were studied. The bearing capacity and deformation ability of aerated concrete filling wall were investigated through the vertical connection of steel bar between the frame beam and aerated concrete block. The results showed that the cracking load of the aerated concrete block is about 80% of its compression failure load, and the aerated concrete block can withstand a certain pressure and ductility after compression cracking. When the aerated concrete block is bended and tensile，its brittle fracture characteristic is showed. When aerated concrete infill walls and beams are connected by mortar, the mortar layer is failure by shear, filling the wall cracking along the horizontal mortar joint. When the filling walls and beams are connected with the vertical steel bar, the yield strength and ductility of the filling walls are obviously improved owing to steel bar and mortar, thus the aerated concrete is cracked by the bar pulling.
