Based on different hydrostatic pressure,this paper researched the functioning mechanism of rock and soil material friction and viscous poly two strengths,and analyzed the influence laws of material particulate to shear strength,discussed the mechanism of geotechnical material hy-drostatic pressure effect,pointed out that under the conditions of low hydrostatic pressure,the rock and soil materials performance for shear force rate failure,under the high hydrostatic pressure conditions,the rock and soil materials performance for shear stress failure.%以不同的静水压力为基础，对岩土类材料摩擦与粘聚两种强度的发挥机制进行了研究，并分析了材料颗粒对抗剪强度的影响规律，论述了岩土类材料静水压力效应产生的机制，指出在低静水压力条件下，岩土类材料表现为剪应力比破坏；在高静水压力条件下，岩土材料表现为剪应力破坏。
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