The proppant settlement characteristics show the result that, the fluid viscosity has an important effect on proppant settlement which has smaller settlement in the high viscosity than in the low viscosity. In addition, the proppant settlement is not only affected by the fluid viscosity but also subjected to complex fracture networks and composite laying effect of brittle shale. The rapidly fluid back and fracture closure which commonly used in conventional reservoir will lead to proppant back which affects the losses of filled fracture height and the post-fracture production in shale. As a result, it is necessary to keep longer shut-down time to acquire favorable filled fracture height.