Abstract: This paper analyzes the wall protection mechanism of the common inorganic mud,propsoing the new concept of borehole wall protection organic mud,and study the relationship between the physical properties of pile borehole wall protection organic mud with the amount of HPAM by the laboratory comparative experiments,and the degradation process of HPAM,and the organic mud used in bored pile of pepple stratum in Chengdu.Through the laboratory experiments and the practical engineering application,a comprehensive analysis of the advantages and disadvantages of different clay content of organic mud,proposing the organic mud ratio applicable to the borehole wall protection,and do thorough analysis of the degradation and enviromental protection of organic mud,it is concluded that organic mud is degradable,providing a new way for the construction of the bored pile wall protection.