GB/T 24495-2009 focuses on laboratory mechanical testing of horizontal joints between load-bearing walls and concrete floor slabs. In the laboratory, the actual working conditions are simulated, and the influence of vertical loads and bending moments from the floor slabs on horizontal joints is deeply explored. The standard specifies in detail the construction method of the test device, the specific mode of loading and the method of data measurement. With the help of rigorous experimental procedures, the mechanical properties of joints under various force combinations can be accurately evaluated. According to this standard, key data can be provided for the design of building structures and the control of construction masses, so as to effectively ensure the safety and stability of building structures.