This paper proposed a novel optimization strategy for coils used in wireless power transmission and provides magnetic field compensation based on Electromagnetic Halbach Array coils with its auxiliary coils using non-uniform distribution. The main coil is fixed, and the positional distribution of the auxiliary coil is optimised by successive superposition to obtain a uniform magnetic field distribution with enhancement on the upper side of the main coil and weakening on the lower side, which guarantees uniform power transmission regardless of the position of the receiver coil. The attenuated magnetic field distribution ensures that the energy transfer efficiency on the upper side of the main coil is not affected by the excess magnetic field energy distribution on the other side. After simulation, it is found that the upper side coils are densely distributed at the two sides, and sparsely in the middle; the lower side are similar to Helmholtz coils.