The GB/T 9978.4 - 2008 standard focuses on the specific requirements for load-bearing vertical dividers in fire resistance testing of building components. It specifies in detail the loading mode, heating regime and performance evaluation criteria of the components during the test, and standardizes the test process from key aspects such as load-bearing capacity, integrity and thermal insulation. Through this standard, the performance of load-bearing vertical dividers in fire can be accurately evaluated. This provides a basis for the construction industry to select qualified products and manufacturers to improve product mass. It is essential to ensure structural stability and the effectiveness of fire separation in the event of a building fire.