Anchor rod is a kind of building material used to reinforce engineering structures, mainly composed of anchor head, tie rod and anchor body. One end of the anchor rod is connected to the engineering structure, and the other end is anchored in the soil or rock layer. In this way, the anchor rod can withstand the tension generated by soil pressure, water pressure, wind load, etc., so as to maintain the stability of the structure. 12 Anchor rods can be divided into two types: prestressed and non-prestressed. Prestressed anchor rods are usually used in deep foundation pit support, slope reinforcement, landslide control, pool anti-floating, retaining wall anchoring and structural anti-overturning projects. Its composition includes anchor head, tie rod and anchor body, in which the anchor section is located in the soil or rock layer, and the free section refers to the area where the tie rod is connected to the anchor head. The use of anchor rods can simplify the foundation structure, make the structure lighter and more reasonably stressed, and has the advantages of less site occupation, shortened construction period and reduced construction cost. They can be used for temporary support of deep excavation pits or as permanent foundations for engineering structures.The use of anchor rods on the retaining structure of the house foundation pit can effectively prevent the collapse, displacement and settlement of the surrounding soil layers.