A slide assembly includes an outer slide (10), an intermediate slide (30) telescopically attached to the outer slide, an inner slide (90) telescopically attached to the intermediate slide, and a transmitting mechanism (31) detachably attached to the intermediate slide. The outer slide has a blocking portion (11). A fulcrum (365) is formed on the intermediate slide. The transmitting mechanism includes a driving member (35) and a post member (38). The driving member includes a driving portion (357), a lifting end (351), and a resilient member (37). The post member is connected to the lifting end of the driving member and traversed through the intermediate slide. A head portion (381) is formed on the post member and configured for engaging with the blocking portion. The resilient member is attached to the post member for urging the post member to return to an original position.