Comma placements in Chinese text are relatively arbitrary although there are some syntactic guidelines for them. In this research, we attempt to improve the readability of text by optimizing comma placements through integration of linguistic features of text and gaze features of readers. We design a comma predictor for general Chinese text based on conditional random field models with linguistic features. After that, we build a rule-based filter for categorizing commas in text according to their contribution to readability based on the analysis of gazes of people reading text with and without commas. The experimental results show that our predictor reproduces the comma distribution in the Penn Chinese Treebank with 78.41 in F_1-score and commas chosen by our filter smoothen certain gaze behaviors.
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