的 (de) functions as an attributive particle in Chinese, linking adjectives or modifying phrases with nouns to indicate possession or descriptive attributes.

他Tā是shì亚洲学系Yàzhōu xuéxì的de工作人员gōngzuò rényuán，刚gāng从cóng北京Běijīng回来huílái。

He is a staff member of the Department of Asian Studies and just returned from Beijing.