Abstract: In order to study the flow characteristics ofdam-breaching fluid with different turbidity, four mass concentrations of clay mixtures were used to simulate different water turbidity through self-developed simulation test device.The test results showed that:(1) The submerged elevation of the fluid after dambreach increased with the increasing of turbidity, and the submerged elevations of the four kinds of turbidity(10%,20%,30%,40%)respectively were 6.5,7.7,9.0cm and10.5 cm after reaching the downstream 2 m for 3 s.(2) The impact force decreased with the increasing of fluid turbidity, and the peak values of impact force generated byturbidity fluids of grade I(10%),grade II(10%),grade III(10%)and grade IV(10%)at 4 m from the dam toe were 4.1,1.6,0.6 kPa and 0.5 kPa, respectively.At the same time, the impact force can reach the peak value within 4 s(equivalent to 80 s on site)after dam failure.(3) The velocity of fluid decreased with the increasing of turbidity, and the fluid can reach the peak velocity within 1s( equivalent to 20 s on site).