Abstract: Aiming at reducing current blue-green algae blooming, a simple and practical clearing machine was designed to make blue algae lose buoyancy and sinking by damaging its gas vesicles. The algae removal efficiency of blue algae clearing machine was verified through experiments. HydroLab DS5 water quality monitor was used to measure seven indexes including chlorophyll、turbidity and oxygen content. After algae removal machine working an hour, the results showed that the rates were decreased respectively, which is 45% of?chlorophyll content, 61% of turbidity, 50% of oxygen content. The algae removal efficiency of the machine is significant. It can be an emergency equipment for blue algae break out in large area.