Flow conductivity of the proppant fracture system is one of the important parameters of evaluating the effect of fracturing. The effect of the numbers of the proppant diameter，proppant slug，the concentration and existing ways of fiber was studied in laboratory through the experiment of flow conductivity. The importance of parameters on the flow conductivity was analyzed based on orthogonal experimental design and grey relational analysis. The results show that：flow conductivity increases with the proppant diameter；the larger the number of the proppant slug，the less the increasing range of the flow conductivity；when the closure pressure is less than 41 MPa，the more the proppant slugs，the greater magnitude the flow conductivity changing with the closure pressure；the flow conductivity will decrease with the increasing of the fiber concentration，and fiber wrap proppant has the largest impact on the proppant conductivity；parameters that affect flow conductivity are listed in a descending order：closure pressure，the number of proppant slug，the fiber concentration，the exiting way of fiber in the fracture，the diameter of the proppant.