The geothermal energy extraction using the fracture-type reservoir in deep crust more than 350-400oC is suggested. When using the fracture-type reservoir, there is a possibility of aseismic slip rather than seismic slip. However, characteristic and influence on permeability of the aseismic slip is unknown. Therefore, in this study, to clarify the occurrence condition, characteristics and influence on permeability of aseismic slip, injection-induced slip experiment using cylindrical specimen with a 45o tilted tensile fracture was conducted under the condition 200-500oC. As a result, the followings were clarified. 1) there was a difference in characteristics between the slip start and the subsequent slip, 2) the slip velocity at the beginning of slip was affected by the surface shape of the fracture, 3) and the slip velocity of the subsequent steady slip tended to decrease as the temperature increased. Under 350-500oC, the pore pressure at the beginning of slip decreased as temperature increased. Therefore, it is suggested that slower slip with a smaller pore pressure, namely, a more stable slip, may occur as the temperature increases. The permeability change before and after the slip experiment was increased at 200, 250 and 300oC, didn’t change at 350oC and decreased by half at 500oC. But since it is not a large decrease of more than one order, it is considered that a sufficient permeability can be maintained in the real geothermal reservoir.