An analysis of the static forces of pile clamping mechanism and pre-fabricated pile under pile clamping was carried out. The results reveal that the yield of pre-fabricated pile under pile clamping starts from the inner wall contacting with the lower jaw; the sustainable pile clamping force of pre-fabricated pile under pile clamping increases with adding properly contact length between pile clamping jaw and pre-fabricated pile and with augmenting becomingly the outside diameter and wall thickness of pre-fabricated pile. Keywords ：pile clamping；pre-fabricated pile；strength