It is of great importance to identify students' negative emotions so as to avoid accidents. However, most of the students with mental problems seldom express their emotions in some ways, which makes it more difficult for the emotion recognition system to obtain the emotional data of these students. To solve the problem of the lack of data acquisition approaches in emotional monitoring of special student groups, this paper proposes a method to obtain students' real emotions based on emotion-induced writing teaching. First, the channel for acquiring emotion data of the special students is established through writing teaching. Second, students are guided to express their emotions through essays by purposeful writing exercises. At last, this paper proposes an emotion calculation method, which comprehensively analyzes a student's real emotion according to the emotions of a group of essays on positive, neutral and negative themes. The experimental results show that the proposed method can obtain students' real emotions effectively and is much better for students with optimistic and pessimistic personalities. [For the full proceedings, see ED639633.]