The coupler of the capacitive power transfer (CPT) system will suffer high voltage stresses because of small coupling capacitance, which will generate the electric field(E-field) radiation region in space and pose a hazard to human safety. To solve it, this paper investigates the characteristics of the E-field distribution under two different coupler structures and analyzes the E-field distribution under different voltage excitation using finite element analysis(FEA). The FEA results show that the phase angle difference between the primary and secondary voltages of the coupler also causes the difference in the E-field region under the same transferred power. And this phase angle difference is related to the structure of the compensation network, so the voltage characteristics of the four basic compensations are analyzed in this paper. Finally, a series-series(SS) based CPT system with 100 W is built to demonstrate that the desired phase angle can be obtained by parameter design to obtain the desired E-field distribution.