Diversity management has been an important issue for both governments and private sector organizations. Diversity management in organisation is a complex phenomenon that needs effective management if employee’s performance is at stake. Thus, the importance of diversity management cannot be overemphasized due to globalisation and global level fight for human rights that pose free movement of labour and social inclusion may allow certain minorities group who feel excluded from the employment sectors are carried alone. Organisation everywhere in world private or public is interested in employee motivation in order increase performance, profitability ratio, turnover ratios and customer satisfaction. This study intends to assess the impact of diversity management on cooperation’s corporation with reference to Borno Express Transport Corporation Maiduguri. The study used a survey research design with a sample of 113 respondents who were selected through Kreicjic and Morgan (1970) sample size computation formula. A Questionnaires was used as an instrument for data collection. In addition, Chi-square (X2) was used as the statistical tool to test the hypothesis. The hypothesis there is impact of diversity management on cooperation employee’s performance was accepted. The study revealed that diversity management is important tool to boost employee’s performance. Finally, the study recommends that Borno Express Transport cooperation should come up with diversity-enabling policies in order to enhance firm profitability.