The invention discloses a conductor allocation method capable of lowering the surface electric field of a high-voltage direct-current bundled conductor. The method includes: determining the number ofsub-conductors in the high-voltage direct-current bundled conductor and the arrangement manner of the sub-conductors; selecting the sub-conductor, with the highest surface field intensity, in the high-voltage direct-current bundled conductor and the sub-conductors symmetrical to the sub-conductor with the highest field intensity to serve as the sub-conductors with larger sections; presetting the basic radius of the sub-conductors with larger sections, and gradually increasing the basic radius to acquire the radius of the multiple sub-conductors with larger sections; building a corresponding physical model of a double-pole conductor analog line according to the radius of the multiple sub-conductors with larger sections; calculating the maximum value and the minimum value of the maximum surface field intensity of the sub-conductor in the bundled conductor according to the physical model; calculating the ratio of the maximum value of the maximum surface field intensity of the sub-conductor in the bundled conductor to the minimum value of the maximum surface field intensity of the sub-conductor in the bundled conductor and the corresponding radius of the sub-conductors with larger sections when the ratio is minimum to serve as the radius of the sub-conductors, with larger sections, allocated in the sub-conductors.