This paper show a study to reduce this leakage loss at the tip of a blade using 3-D Computational Fluid Dynamics (CFD) based on Reynolds-Averaged Navier-Stokes (RANS) equations. In addition, the winglet tip shapes of blades are compared. The tip shape was fabricated by applying vena-contracta effect in pipe flow. Sharp geometry of various inlet geometry exhibits a minimum contraction factor. A winglet was added to the pressure side of the blade tip to increase the contraction coefficient of the flow through the narrow portion. Adjust the height of the wing to adjust the sharpness of the entrance by setting three points on each corner of the added winglet. Models Winglet1 and Winglet2 were made by adding the winglet shape to the pressure-side of the wing tip. Winglet 1 has the same height of tip clearance and winglet, and Winglet 2 has winglet height twice as high as tip clearance. As a result, tip leakage flow through the tip gap with a higher contraction coefficient was reduced in the sharp winglets of the tip inlet shape. Moreover, the strength of tip leakage vortex generated in the suction-side part of the rotor blade is reduced, thereby reducing the leakage loss.