GB/T 15972.50-2008 Focus on the test of constant heat and humidity in the environment performance of optical fibers. It specifies test equipment for simulating constant heat and humidity environments, such as specific parameters of the test chamber with controlled temperature and Humidity. Detail the preparation and Installation method of optical fiber samples, placing them under specific constant temperature and Humidity conditions for a specified period of time. Stability in heat and humidity environments is evaluated by monitoring the Optical inspection, Mechanical Property changes of optical fibers before and after the test, such as attenuation, strength, etc. This standard provides the basis for the mass control of optical fiber products, ensuring the stable transmission of optical fibers in heat and humidity environments, and helping the reliable operation of communication networks.