Based on the mechanism of soil adhension and the theory of interfacial water film the area and the thickness of water film between soil and metal surface were measured by the concentration polarization Electrochemical Measuring Method (EMM). The measurement was carried out by a testboard which consists of a soil adhesion instrument, an interfacial water film instrument and so on. The adhesive patterns of interfacial water film between soil and metal surface were investigated and their mathematical models were established. The experimental results indicated that: (1) When the water content in soil is between liquidus limit and plastic limit,the increasing of the area and thickness of the interfacial water film conforms to the changing pattern of the quadric curve with the pressure increasing. (2) Under the same pressure respectively,the area and the thickness of the interfacial water film increase with increasing of the water content in soil. The higher the water content in soil, the faster the increasing speed. (3) When the water content in soil ranges between liquidus limit and plastic limit and keeps constant, the adhesion increases linearly with the pressure increasing. (4) When the water content in soil ranges between liquidus limit and plastic limit and the pressure keeps constant, the adhesion increases linearly with increasing of the water content in soil.