Compound-leaned blades have been applied for the design of turbomachinery for reducing secondary flow losses and then improving the aerodynamic performance. The aerodynamics features are not clear enough so far and, therefore, have been investigted by many authors experimentally and numerically. The present study on turbomachinery aerodynamics is emphasized on the leaning effects of straight-leaned turbine nozzle blades With low span-diameter ratio (less than 0.1). This Kind of blades has relatively low efficiency. This is due to that the blades are too short and then the loss contours of both tip and hub surfaces are merged with each other. How to increase the efficiency efficiency becomes of the important subjects, which is faced to the turbomachinery community. Effects of straight-leaned blades in a turbine nozzle blade row with low span-diameter ratio have been assessed using three-dimensional steady Reynolds-averaged Navier-Stokes computations. Compound-leaned blades have been applied for the design of turbomachinery for reducing secondary flow losses and then improving the aerodynamic performance. The aerodynamics features are not clear enough so far and, therefore, have been researched by many authors experimentally and numerically. The present study on turbomachinery aerodynamics is emphasized on the leaning effects of straight-leaned turbine nozzle blades with low span-diameter ratio (less than 0.1). This Kind of blades has relatively low efficiency. This is due to that the blades are too short and then the loss contours of both tip and hub surfaces are merged with each other. How to increase the efficiency efficiency becomes the important subjects, which is faced to the turbomachinery community. Effects of straight-leaned blades in a turbine nozzle blade row with low span- diameter ratio has been assessed using three-dimensional steady Reynolds-averaged Navier-Stokes computations.