Abstract: In order to reveal the influences of morphology of protecting wall of anti-sliding pile on soil arching effect,the paper introduced the morphology coefficient h of protecting wall of anti-sliding pile,numerical simulations were carried out based on plane stain FEA models.Soil deformation and stress around piles were investigated to explain the influence of the morphology of protecting wall on pile-soil interaction.The results show that the soil arching effect of soil around pile,soil stress and deformation are correlated to the morphology of the outer wall of pile.When h=4 cm or 8cm,the change of soil stress and displacement increases obviously,which enhances soil arching effect;when h> 8 cm,soil stress and displacement decrease with h gradually;when h is close to the extreme,the stress of soil and displacement around pile change little,in this case,the morphology of the outer wall of anti-sliding pile on soil arching effect does not play a positive role.