The present study examined Chinese adolescents' emotion regulatory tendency and its effect, using an Experience Sampling Method. Participants comprised 72 Chinese adolescents (M age = 15.2 yr., SD = 1.7; 36 girls). Momentary emotional experience and regulation was assessed up to 5 or 6 times each day for two weeks. Results showed that participants tended to use up-regulation when they experienced positive emotion and habitually regulated their negative emotion by down-regulation. Also, adolescents who utilized down-regulation in a certain sampling moment reported higher positive emotion at the subsequent sampling moment. Moreover, adolescents who utilized down-regulation more frequently reported higher positive emotion at the subsequent sampling moment. Overall, down-regulation seemed to be a more adaptive regulatory strategy than up-regulation in Chinese adolescents' emotional lives.