As the absolute level of thermal sensation is vague for human beings, one cannot correctly select the absolute level of the multi-point thermal sensation scale with any kinds of precise classification. To achieve a breakthrough in such a situation, we propose a new voting method based on the relative change of thermal sensation, and investigate the thermal sensation under the unsteady thermal environments. It is shown that the new voting method is essential for the evaluation of thermal sensation under the unsteady environments and brings some aspects of the thermal sensation under the unsteady environments. Furthermore, we discuss the standardization of the thermal sensation in detail, and propose a new parameter for the standardization.