The invention discloses a symmetrical four-branch stack winding connection method which features that that pole pair of winding are odd, the slots per pole and per phase are 2n, and n is any positiveinteger. The distribution law of each phase winding is the same. By adjusting the span of two pairs of poles, a symmetrical four-branch stack winding with span of 3 *2n, 3 *2n +1 and 3 *2n-(2n-1) slot spacings is constructed; As that invention break the limitation of the traditional AC winding theory, A symmetrical four-branch stack winding connection method is provided for an electric machine with odd pole pairs, The contradiction between the capacity, voltage and rotational speed of the large pumped storage motor and the hydro-generator is effectively solved, the performance of the motor isimproved, the structure of the motor is reasonable, the manufacturing and installation process is excellent, the maintenance is simple, the operation is reliable, and the technical and economic indexes of the whole power station system are improved.