Abstract：Firstly the division of synthetic energy，the structural entropy of soil，the quantitative structure parameters of soil and the concept of exchange between entropy and energy are proposed. The framework of traditional soil mechanics in which homogeneous theories are applied to solve problems of non-homogeneous soil is changed，and the conception of structural entropy is discussed，which leads to a ration of many complex elements by the unified state of entropy. A quantitative parameter for soil structure characteristics also is provided，which is named entropy and energy exchanging parameter. The principle of macro and micro energy state exchanging will be especially emphasized and investigated.
