Emotional expression has played an important role in our social life. This is especially true for leaders who have unequal power during the interaction with followers. According to the EASI model, we explored whether supervisor¡¦s negative emotional expression influenced follower¡¦s task performance by examining the moderating effects of follower's conscientiousness, agreeableness, power distance orientation, and perceived supervisor power on such relationship. In present study, we collected data from 34 companies of different kinds of industries, including 191 leader-follower dyads from 86 supervisors and 191 followers. The results of the hierarchical regression analysis showed that followers¡¦ conscientiousness and agreeableness positively moderated the relationship between supervisor¡¦s negative emotion expression and follower¡¦s task performance. Furthermore, under the condition of follower¡¦s low power distance orientation and low perceived supervisor power, the relationship between supervisor¡¦s negative emotion expression and follower¡¦s task performance became negative. Finally, theoretical and practical implications of our findings are also discussed.