Flow conductivity of fracture network is one of the key factors influencing reformation effect in tight reservoir.New diversion chamber was designed. Indoor flow conductivity experiment was made to study the influence of closure pressure，sand concentration，sandbank height，proppant diameter and type and fracture network structure on the flow conductivity of fracture network，and orthogonal experiment was made to analyze the effect degree of different factors. The results show that with the increase of closure pressure，the flow conductivity of fracture network will decrease slowly，then sharply，finally gently；with the increase of sand concentration and sandbank height，the flow conductivity will increase；the flow conductivity increases with proppant diameter，and the loading capacity of large particle is relatively poor，resulting in quick decline of flow conductivity with the increase of closure pressure；the flow conductivity will increase with larger amount of secondary fractures and smaller distance to exit end. For the effect degree of different factors on flow conductivity，the influence of closure pressure is outstanding；the influence of secondary fracture distribution and proppant diameter is large；the influence of sand concentration and secondary fracture amount is relatively low；while the influence of sandbank height and proppant type is weak.