Abstract: The influence of the testing time on the fracture conductivity was investigated by using the quasi-triaxial core holder to compress the fractured cores.The experimental results indicated with the increase of the testing time,the diversion ability gradually decreased,before 60 min it declined faster,after 60 min it declined slower.The error of curve fitting was relatively large,and the error decreased as the pressure time increased.By using the fitting formula,the conductivity of the pressure was predicted,and the workload of the experiment was reduced.When the cracks were at the closing stage,the rock was under compression,which was consistent with the actual situation of reservoir.The results at this stage could be used for diverting capacity of reservoir evaluation,which more truly reflected the condition of reservoir fracture diverting capacity and the relationship between the stress.