The Valley of Terror effect is the psychological phenomenon of human revulsion and unease caused when robots or simulated characters look and behave highly similar to humans but not exactly the same. Many experimental studies have verified the Valley of Terror effect to some extent. The Valley of Terror effect can be explained from a variety of perspectives, such as human evolution, cognitive development, and the characteristics of the cognitive process, etc., but the conclusions of the various studies on the interpretation of the Valley of Terror effect are also different. However, with the development of science and technology, human-machine cooperation has become a major trend, and we need to understand and explore the impact of the Valley of Terror effect on human-machine cooperation.