This standard specifies a test method for assessing the burning behavior of carpets at a 45° angle under laboratory conditions. The core of the method involves fixing a carpet specimen at a 45° angle inside a specific 45° combustion test chamber, igniting its lower edge for a specified duration using a small gas burner, and then comprehensively evaluating the carpet's burning performance by measuring and observing indicators such as flame spread distance, damaged length, afterflame, and afterglow time. This test method is primarily applicable to various textile floor coverings, aiming to assess their flame-retardant properties by simulating flame contact scenarios at a specific angle.