Currently, two-speed or multi-speed energy-saving remanufacturing of motor system is generally realized by improved design of stator winding. But the energy efficiency at different speeds should be close to each other so that the optimal efficiency can be achieved under different rotating speeds in some special conditions. In response to this demand, three single-winding two-speed schemes of stator winding are compared, and it is found that the reverse commutation method can maintain a relatively high fundamental winding factor for both pole pair numbers. The effects of different pitches and winding turns on the motor performance are analyzed by finite element method, and the optimal winding design scheme is proposed. Taking a 5.5 kW, 4-pole motor as an example, the proposed method is used to carry out a 4/6 pole winding design and experiment validation. The results show that the motor efficiency is generally the same under the two speeds, which verifies the feasibility and effectiveness of the proposed design method.