(1) Classified by wall materials 1 Bricks used as walls in brick walls include ordinary clay bricks, clay perforated bricks, clay hollow bricks, coke residue bricks, etc. Clay bricks are fired from clay and can be divided into red bricks and green bricks. The coke slag brick is steam cured with blast furnace hard slag and lime. 2. Aerated concrete block wall Aerated concrete is a kind of lightweight material, which consists of cement, sand, ground slag, fly ash, etc., and is made by steam curing with aluminum powder as foaming agent. Aerated concrete has the characteristics of light volume, sound insulation and heat preservation. This material is mostly used for non bearing partition walls and infilled walls of frame structures. 3. Stone wall stone is a natural material, which is mainly used in mountainous areas and stone producing areas. It is divided into random stone wall, whole stone wall and wrapped stone wall. 4. The plate wall plate mainly consists of reinforced concrete plate and aerated concrete plate, and the glass curtain wall also belongs to this category. (1) The whole block wall made on site in the frame, without brick joints and slab joints, has outstanding overall performance. The main material is light aggregate reinforced concrete, the operation process is shotcrete, and the overall strength is slightly higher than other structures. In addition, the reasonable on-site structural design is particularly suitable for earthquake prone areas, long-span factory building and large commercial center partition. (2) According to the location of the wall, the wall is generally divided into two parts: the external wall and the internal wall. Each part has its own vertical and horizontal directions. In this way, four types of walls are formed, namely, the vertical external wall, the horizontal external wall (also called the gable wall), the vertical internal wall, and the horizontal internal wall. (3) According to the classification of wall stress, walls can be divided into load-bearing walls and non load-bearing walls according to the different structural stress conditions. The wall directly bearing the load from the upper roof and floor is called load-bearing wall; The wall that does not bear the upper load is called non bearing wall, which includes partition wall, infilled wall and curtain wall. The partition wall is used to separate the indoor space, and shall meet the requirements of sound insulation, fire prevention, etc. Its weight is borne by the floor or beam; Infilled walls are generally filled between the columns and walls of the frame structure; The curtain wall is a light external wall suspended between the external skeleton or floor. The external infilled wall and curtain wall bear wind load and seismic load. (4) According to the wall structure, it can be divided into solid wall and empty wall according to the different construction methods. Solid wall: the wall built with single material (brick, stone, concrete and reinforced concrete, etc.) and composite material (reinforced concrete and aerated concrete layered composite, clay brick and coke slag layered composite, etc.) without gaps; There is a cavity in the empty wall, such as the empty bucket wall.