A socket adapted for electrically connecting a semiconductor package to a printed circuit board, comprises an insulating body and a plurality of position clump. The insulating body has a plurality of sidewalls, which define a plurality of assembling slots. The position clumps are movably assembled to the assembling slots of the insulating housing, each of the position clump has a position block and a spring member disposed between the position block and the insulating housing, the position block has a supporting face for supporting the IC package and is able to downwardly move toward the mating face of insulating housing.