Faced with the challenge of high energy ablation problems, especially for laser ablation, effective energy dissipation protective materials fabricate by efficient preparation method is a feasible solution. The Ni-graphite/Si O_2 coatings with different Ni content were prepared by plasma spraying method with optimized plasma spraying parameters. All coatings are pure without oxidation and dense. Their ablation behaviors were investigated by high power continuous wave laser. The results indicate that the Ni-graphite/Si O_2 coating with appropriate Ni content could realize the purpose of energy consumption by endothermal reaction of graphite/Si O_2 and reflection improvement. High Ni content will block the occurrence of endothermal reaction of graphite/Si O_2 and increase the heat diffusion to interior part of coating, which can make the ablation situation of coating more serious.