Abstract: A single fracture in sandstone rock was formed by splitting to simulate the natural extension fracture. Coupling experiments on stress and seepage of the rock with single fracture were performed through electric-fluid serving triaxial compression machine.Examing how seepage flow changes with time by different confining pressures and water pressures under triaxial stresses.And making a discussion on the seepage laws in sandstone within single fracture under triaxiality stresses.