Abstract: Humidity resistance test methods in GB standards, ISO standards and ASTM standards were introduced, and the test methods were summarized. Heat and humidity, condensation(in-cabinet exposure) and water fog were all in test atmosphere of high temperature and humidity, whose impetus for condensation was relatively smaller. While the temperature difference was large with the condensation(single-sided exposure), and the impetus for coating damage was large, so with the same test temperature, condensation was easier to happen. The condensation(single-sided exposure) was a preferred option when the humidity resistance result of coating, especially resistance performance to condensation, was urgently needed.