This study investigated college Chinese a second language learners' word segmentation error patterns in reading instructional-level Chinese sentences, the relationship between word segmentation errors and reading comprehension, and learners' perspectives on the role of word segmentation in reading comprehension. The results showed that the learners made five types of word segmentation errors. Four of these types moderately correlated with reading comprehension. The survey data showed that most learners considered word segmentation skills important in reading comprehension. This perception became stronger as the learning level advanced. The learners suggested that three factors hindered them from performing accurate word segmentations.