Learner attention affects learning efficiency. However, in many classes, teachers cannot assess the degree of attention of every student. When a teacher is capable of addressing inattentive students immediately, he can avoid situations in which students are inattentive. Many studies have analyzed student attentiveness by the applying of Image Detection Technologies. If this mechanism can be applied to inclass learning, it will help teachers keep students attentive, and reduce teacher load during class. This study mainly applies Fuzzy Logic analysis of student facial images when participating in class. Applying Fuzzy Logic can prevent erroneous judgments associated with a single term, and help teachers deal with student attentiveness