The author examined 2 distinctive aspects of emotion regulation in mathematics homework, including emotion management and cognitive reappraisal. Participants were 1,799 high school students from 46 classes in China. Two multilevel models were run, 1 with emotion management and another with cognitive reappraisal as the dependent variable. Both emotion management and cognitive reappraisal were positively associated with 5 individual-level variables (monitoring motivation, managing time, learning-oriented reasons, self-concept, and teacher feedback) and 1 class-level variable (self-concept). In addition, at the individual level, emotion management was associated negatively with adult-oriented reasons but positively with arranging the environment and prior mathematics achievement. Meanwhile, cognitive reappraisal was positively associated with parent education at the class level.