A ZIF socket assembly used with a package (6) comprises a ZIF socket (5), an actuating tool (8) and a protector (7). The socket comprises a base (51) and a sliding cover (53). The base comprises a recess (514) at an end thereof. The sliding cover is moveable assembled on the base for mounting the package and comprises a slot (533) in alignment with the recess. The protector is placed on the package and comprises a number of legs (71) extending downwardly for pressing against edges of the package. A contacting portion (73) extends outwardly from an edge of the protector and has a guiding face (75). The actuating tool is inserted into the recess through the slot and is rotatable from an initial, inclined position to a final, vertical position to drive the cover, the package and the protector to move with respect to the base.