This paper proposes a five coils array united structure for implantable wireless power transfer system. The coil structure comprises a radiating coil and a driving coil. The driving coil drive radiating coil to radiant power. Both coils resonate at 13.56MHz.It can generate almostly uniform magnetic distribution which would improve the wireless power transfer system dislocation tolerance. At 13.56 MHz, the S parameter is used to calculate the system efficiency. The five coils array united structure is fabricated on planar printed circuit board. The structure is compact and suitable for implants. According to the experimental results, the maximum efficiency of the system can reach 54.7%(transfer distance from 10mm to 20mm).While the maximum efficiency is 54.95% with a dislocation from 5mm to 10mm. And almost all efficiency values are above 50%. Efficient and stable power transmission is realized.