This qualitative case study explores the interaction between Chinese college student writers' voices and their teacher's use of online materials during one semester-long writing course. It shows that, when acted upon selectively and critically, students' voices can potentially improve their teacher's use of online materials. This practice, in turn, can help students gain effective and necessary knowledge of writing. This study also shows that students' interactions with their teacher seem to lead to bolder and enhanced narration of their voices on how to teach optimally through online materials.