Abstract：In order to study the rule of effects of temperature and effective pore pressure on rock permeability，the 20 MN servo-controlled triaxial rock testing machine with high temperature and high pressure is used to research feldspar fine sandstone¢s permeability with time under different temperatures and triaxial compression tests. The rock sample is cylinder-shaped，and the dimensions of rock sample is f 200 mm×400 mm. With the experimental results，there is a temperature threshold of feldspar fine sandstone¢s permeability during the rising course of temperature. Feldspar fine sandstone¢s permeability rises abruptly when feldspar fine sandstone¢s temperature reaches its temperature threshold. The permeability of feldspar fine sandstone is 65 times against that under indoor temperature. Moreover，it exceeds the threshold of pore pressure in the area of temperature threshold of feldspar fine sandstone at the same time. At the threshold of pore pressure，feldspar fine sandstone¢s permeability changes acutely，rising more than that under low pore pressure. The effect of pore pressure on feldspar fine sandstone¢s permeability declines even if raising feldspar fine sandstone temperature over the temperature threshold of feldspar fine sandstone.
