It is necessary to provide a temperature and humidity change environment for scientific research and production units such as aerospace, aviation, petroleum, chemical industry, military, automobile, shipbuilding, electronics, communication, etc., to simulate the adaptability test of the test product under the environment of temperature and humidity change and the adjustment of electronic components. Safety testing provides reliability testing, product screening, etc. It is widely used in high temperature test, low temperature test, temperature-low pressure test function of various connectors, cables, micro-motors, etc.