The way of resonance ground of arc suppression coils at neutral point can extinct the grounding arc effectively. Both preset mode and post-set mode have their drawbacks. Thus,a new kind of arc suppression coil combined with coarse and fine adjustment was designed. The coarse adjustment is using turns adjustable arc suppression coils, while the fine adjustment coil is using magnetic bias style. And a control system based on single chip computer was designed to accomplish the auto-turning of arc suppression coils. And the MATLAB simulation on automatic tracing compensations of arc suppression coils proved the feasibility of this scheme.