Today's works are often completed in a team, organizational performance can be improved through team cooperation, communication and coordination. However, the personality diversity of team members will affect team performance and may have positive or negative impacts. The results of past research are inconsistent, so the relationship between team personality diversity and performance may be affected by the moderator factors. This study investigated the effects of team personality diversity on design performance, and use u201cteam relation-oriented diversityu201d as moderator. In this research, the variables that measure the team relation-oriented diversity include gender diversity, diversification of birth order, and diversification of family socioeconomic status. And the diversity of personality traits includes five major personalities- neuroticism, conscientiousness, openness to experience, extraversion and agreeableness. The dependent variable, the performance of the design team, was measured by whether the teams advance to the semifinal or not.The sample of this study is based on the u201cDesign Competitionu201d and this research divided into two phases for analysis. The first phase is a quantitative study. Participants are required to fill out the questionnaire when registering online. After sorting the data, there are 319 people grouping into 171 teams, deleting the invalid questionnaire and single participants, there are 148 teams was composed of 296 team members, the valid response rate is 92.7%. And the second phase is a qualitative study. Analysis the special features of the 17 teams which was advance to the final competition.After logistic regression statistical analysis, we found that (1) The average level of team extroversion has a significant negative impact on design performance. (2) Gender diversity ofteam members has a negative impact on design performance. (3) The diversification of family socioeconomic status was positively related to the design performance. The result of qualitative study found that: (1) The socioeconomic status of team members will positive impact performance. (2) The design performance of the same-sex group is better than the heterosexual group. (3) The birth order has a positive impact on design performance.According to the results of the study, this study suggests that personality traits can also be included in the selection condition when recruiting talents. In addition, should be aware of the demographic background in the composition of the team, to allows the team to maximize its effectiveness.