Abstract: In order to study the effect of slurry on the bearing performance of bored piles,the function and the effect mechanism of slurry were analyzed.Through the analysis on the static load test results of piles of a bridge,some conclusions could be drawn: the quality of slurry would have direct effect on the thickness of settled materials of pile tip and the thickness of slurry skin on piles,and further would have great effect on the bearing performance of bored piles.So the quality of slurry should be in cluded into the bearing performance analysis model of bored piles.Finally,the experiences in principles and methods of preparation,management and arrangement of construction of fine quality slurry were summerized.