Known for their environmental benefits and low energy consumption, the rapid advancement of eVTOL aircraft has created an urgent demand for low-power FLCCs. The traditional low-power design methods for embedded computers do not consider the requirement of high reliability and high security, so it does not apply to the low-power design of the FLCC. In this paper, a series of low-power design methods tailored for FLCC are proposed, covering the system, architecture, and register transfer levels. Taking the low power design of bus transmission module in the FLCC as an example, the specific implementation of the proposed methods is demonstrated. Simulation results indicate that the proposed methods reduce power consumption in the design samples by 9.64% and decrease the occupancy of Slice Registers and Slice LUTs in the FPGA by 2% respectively, confirming the effectiveness of the methods.