Personal control behavior has potentials for both saving energy and maintaining comfort of human body. However, few studies are found on the influence of personal control behavior on thermal comfort in hot and humid environment. In this study, a series of experiments of personal-controlled desk fan were conducted in a hot and humid environment. In total, 24 subjects were invited to participate in the experiments and they experienced the environments which were set at 26, 28, and 30 ℃ with fixed or free-controlled local air flow, respectively. The experiment analyzed the comfort of the subjects under different working conditions. The results show that the use of desk fan significantly improved the subjects' thermal comfort. And the individual control behavior can not only lead to a better thermal comfort situation, but also show potential in energy-saving. When the subjects could freely control the fan, the thermal sensation is very close to neutral, and the average power of fans is at the lowest level.