Abstract: A spacial twisted and bowed turbine guide blade was designed to improve the aeroengine performance.In order to maintain the design point of compressor,total temperature,total pressure and mass flow before the guide blade,and total pressure of turbine outlet is raised by using spacial twisted and bowed guide blade,so that the thrust may be improved by reducing the nozzle throat area.The characteristics of original turbine and the turbine with twisted and bowed guide blades were numerically simulated and analysed.The results demonstrate that the design concept and method are reasonable and useful.