Abstract: In order to explore the effect of noise level on unsafe behavior of humans,15 subjects were exposed to four different noise environments when performing a disc tracking task. Their heart rate and skin potential were monitored by an acquisition system of Captive physiological indexes . The number of failures to do the tracking tasks was also recorded.The data were analyzed by using the software of SPSS19. 0.It was found that a high noise level resulted in high values of skin potential, heart rate, and skin temperature,and that it also resulted in a large numbers of failures to do the tracking task. ANOVO analysis shows that gender has significant effects on physiological parameters and attention,and that noise exposure for a short period of time does not significantly affect the person's physiological parameters, but can significantly affect the person's attention focus ability.The Duncan's multiple range test results show that the number of the failures under the medium or high noise level condition is significantly larger than that for the low noise or quiet condition, while the difference between that for low noise level and that for quiet state is not great.Regression analysis shows that the power function model can well reflect the effects of noise level on the people' attention.

Key words: noise, unsafe behavior, number of failures, physiological parameters, attention