Abstract: In the light of the complexity of nature fracture networks,it is extremely difficult to do the numerical calculation of fluid flowing and the design optimization of developing well patterns.A series of electric analogy experiments were conducted based on the similarity theory in this paper to model the fracture networks and horizontal well upright well patterns.The relations between fracture networks and horizontal well patterns were studied,and the properties of fracture networks to effect the rate of horizontal wells,such as discreteness,connectivity,density and orientation,were emphasized.As a result,the valuable parameters to optimize horizontal well designing and pressure fracturing for such complicated reservoirs were presented.