The sand?carrying migration law of slick water in fractures is of great guiding significance to the practice of slick water fracturing.Sand transport profiles with different injection parameter combinations were tested by a visual parallel plate fracture simulator.The results show that the sand?carrying capacity of the slick water is favorable under the combination of slick water for fracturing +70~140 mesh proppant +8% sand ratio.In this case,no sand banks are observed at the fracture inlets,and the proppant does not fill the fractures adequately,under the combinations of low?viscosity slick water +40~70 mesh proppant +10% sand ratio and high?viscosity slick water +20~40 mesh proppant +20% sand ratio, the amount of sand filling fractures is large, and the sand banks in deep fractures are high,while the filling at fracture inlets is poor.With the increase in construction displacement, the various combination modes all exhibit growing positions of the front edges of the sand banks, decreasing heights of front edges, and insignificant changes in balance heights. Injection combination is an important aspect affecting the sand bank pattern. The sand bank patterns and characterization parameters corresponding to different injection parameter combination modes vary greatly. Therefore, the combination mode needs to be optimized on site to improve the conductivity of fractures at the inlet.