The distributed-turn winding coil has received much attention due to its excellent anti-offset properties. In this paper, the effects of different core structures on the magnetic field distribution and electrical parameters of distributed turn winding coils are investigated. Based on finite element simulation, the magnetic field distribution and core electrical parameters including self-inductance and mutual inductance of distributed-turn winding coils with different core structures are analyzed. It is found that the self-inductance and mutual inductance of distributed turn-wound coils with different core structures can be stabilized throughout the offset process. Compared with the coils without core structure, the coils with core structures have significantly improved magnetic field uniformity and coupling strength. In addition, a comparison of the characteristics of coils with different core structures shows that arrayed ferrite structure is more favorable in improving the uniformity of mutual inductance.