Estimating when the occluded moving object arrives at a particular location is called the time to contact. Based on the occlusion paradigm, two experiments (2 physical velocity ×3 time structure) were designed to investigate the impact of the three factors on the TTC by manipulating the time structure, physical velocity and visual velocity. Results: When the time structure is consistent, there is no significant difference in the participants' performance whether the physical speed was fast or slow and whether there were visual speed cues. When the time structure is inconsistent, regardless of the physical speed, the AE of participants under the condition with visual velocity is less than that under the condition without visual velocity. Conclusion: when the time structure is consistent, the participants mainly apply the time structure cue to estimate TTC. However, when the time structure is inconsistent, the participants estimate TTC by integrating the time structure cue and the visual velocity cue.