Based on the characterization methods of unit cross sectional layer S and its performance cHS,the range of HB1xhas been evaluated. The feature of fault Z3（=(2.5±0.5）mm) and the main factors that affect the permeability of concrete in surface layer have been provided. The HB could be divided into two layers, HB，Ⅰareaand HB，Ⅱarea. The distribution model formula of chloride has been established, its physical meaning and application have also been clarified. The results showed that the magnitude of stratified sampling is appropriate at the sub millimeter level. A quantitative model for concrete structure related to the layer hierarchy is given. The characterization methods of S and cHS are universal.