Application of high and low temperature alternating cycle test box: The high and low temperature alternating cycle test box is suitable for testing the performance indicators of aerospace products, information electronic instruments, materials, electrical and electronic products, and various electronic components in high and low temperature or humid and hot environments. Product features: The high and low temperature alternating cycle test chamber has a large observation window with lighting to keep the chamber bright, and uses tempered glass embedded in the heating body to observe the condition inside the chamber clearly at any time. Separating the humidification system pipeline from the control circuit board can prevent malfunctions caused by water leakage in the humidification pipeline and improve safety. The waterway system pipeline circuit system adopts a door opening, which is convenient for maintenance and inspection.