Control of jet-flap on turbine cascade flow was studied.An experiment was conducted to study the impacts of the jet-flap which were blown out by a row of jet holes which were in diameter of 1mm and were near to the trailing edge on the pressure surface of gas turbine blade.The experiment adopted different shapes of jet-flap with different mass flows under various flow conditions.The experiment results show that jet-flap can effectively control the mass flow and the turning angle.When Reynolds number is 71742

Mach number is 0.048

turbulence is 1%

and the jet flow reaches to 4% of the mass flow

the mainstream mass flow is reduced by 13.32%

and the turning angle is increased by 6.34%.Along with the increase of the jet flow

the loading coefficient decreases and the total pressure loss coefficient increases.