| The driver factor plays the primary role in influencing traffic safety. The visual system as the leading channel for information acquisition is of great importance. There are several reports on drivers' visual search behavior affected by road traffic environments, as well as in relation to other factors such as vehicle speed. It is necessary to analysis drivers' visual search behavior characters together with its influence factors, so as to carry out further study on drivers' dynamic vision.Based on the review and analysis of drivers' dynamic visual characters and related theories, this article carried out the experimental study on drivers visual search behavior. The experiment was carried out on a straight section in experimental court, with vehicle speed and road sign text height as controlled variables, eye movements data such as horizontal and vertical visual angles and gazing time (fixation duration) were collected from 13 subjects by using an eye movements tracking device. Data from 7 subjects were accepted to be valid by filter and analysis. Effects of vehicle speed and road sign text height factors on these eye movement data, such as variances of visual search, fixation duration and visual angular dispersion were explored by analysis of variance (ANOVA).Analysis result indicates that, vehicle speed together with road sign text height shows no significant effect on drivers' visual search extent; drivers' mean fixation duration ranges basically between 260～330ms and is effected little by vehicle speed and road sign text height; drivers fixate mostly in road centre area, fixate more often on the left side and closer to the vehicle, and drivers spread their fixations to the far side gradually with the increasing of vehicle speed.
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