GB/T 328.14 - 2007 is used to determine the low temperature flexibility of asphalt waterproofing membranes. This standard specifies the requirements for test equipment, such as Temperature control accuracy of cryogenic boxes. Specify the sample preparation, specify the size and shape. During the test, strictly set the low temperature Environmental temperature and holding time, and clarify the bending Operation mode, such as bending radius, speed, etc. Through specific operations to observe the flexibility performance of the membrane at low temperature, and determine whether the low temperature flexibility is up to standard according to the results. This provides a basis for evaluating the applicability of asphalt waterproofing membranes in cold environments, and helps building waterproofing projects to select suitable materials in low temperature areas to ensure waterproof effect.