In order to improve comprehension for the rule of interaction between pile,soil and pile caps,the software ABAQUS was applied to stimulate the different working properties of anchored silent group piles' foundation under different pile length,side length,pile spacing,number of pile and thickness of piles cap.The effect coefficient of group pile and undertaking ratio of pile cap will decreased with the increase of pile length and number of piles,but not the pile spacing.The results will be useful to the guidance of pile foundation design and make the design of pile to accord with real working conditions.