成岩成矿的外部条件中压力是很重要的因素。地下岩石所受的压力不仅来自上覆岩石的重力 ,而且来自构造力和热力及其它力。这些力合成一个三轴不等的应力状态 ,相当一个以最短轴为半径的球状应力迭加一个差应力。前者影响成岩成矿和变质作用 ,后者控制岩石变形和组构的变化。通过三维应变应力测量 ,这两部分力通过计算是可以区分开的 ,因而这将是建立地下深度测算新方法的一个基础 Pressure is an important factor in the external conditions of diagenesis and mineralization. The pressure on underground rocks comes not only from the gravity of the overlying rocks, but also from the tectonic and thermal as well as other forces. These forces synthesize a three-axis unequal stress state, equivalent to a spherical stress with the shortest axis as a radius superimposed on a differential stress. The former influences diagenetic mineralization and metamorphism, while the latter controls the deformation of rock and the change of structure. Through the three-dimensional strain stress measurement, these two forces can be distinguished by calculation, so this will be a basis for establishing a new method of underground depth measurement