Abstract: There are many structural planes such as joints, faults, weak intercalations, strata planes, schistosity and gneissic schistosity in the rock mass. The different combinations of structural planes form the structural bodies of vary formations and sizes. This paper gives out the calculation models and comparations to two groups and multi-groups structural planes of the same tendency and two groups structural planes of the anti-tendency. We finally obtain the profitable conclusions with different combination of dip angle and vary calculation conditions.