This study explore whether cognitive load arising from learners' self-directed activities are significantly related to learners' cognitive activities in video-based environment where self-directed learning elements are implemented. Eye tracking and learning performance data of the experimental group (n = 60) of self-directed learning environment and comparison group (n=49) without the self-directed elements were collected in the first semester of 2018. Statistical difference verification and correlation analysis was performed subsequently. Study shows significant difference of cognitive load between two groups. In comparison group, the variables related to fixation and saccade have a significant correlation with learning achievement. There was no correlation between the indicators of cognitive load and learning performance in the experimental group. However, there have been differences in the kinds of indicators that correlate with performance between two groups, indicating that the variables related to cognitive load may differ depending on the supporting factors available to learners.