The FFC process is an important method to replace the traditional titanium preparation methods that high pollution and high energy consumption. However, low efficiency and long electrolysis time hinder the development of the FFC process. Therefore, in order to improve the deoxidation rate, the effect of cathode thickness on the deoxidation rate was studies. Meanwhile, the quantum mechanics method was used to study the conduction mechanism of TiO₂. Based on the experimental and calculated results, a multi-layer cathode was proposed to improve the deoxidation rate. The titanium sponge with 3 500-4 000 ppm oxygen content was obtained after 6 h electrolysis. The electrolysis speed is effectively improved when compared to the tradional cathode. Another benefit of multi-layer cathode is to slove the problem of contradiction between deoxidation rate and production of FFC process.