Because of the characteristics of damping collapse loess under dead weight,by the comparative analysis on pile construction design in Construction Standards of Damping Collapse Loess Area(GB 50025-2004)and Technical Regula- tion of Construction Pile Foundation(JGJ 94-94),Based on analytical calculation on the field case and according to nega- tive friction mechanism-nutral point theory,it is expounded that for pile construction design in damping collapse loess un- der dead weight,neutral point should be taken into consideration and negative friction not be substitute in total.