According to the principle of the capacitive grating rotary encoder and the predetermined technical indicators, the circuits of 2 capacitive grating encoders of different resolutions are designed. Through PCB design, plate making, assembly and testing, the relevant performance indicators are analyzed. The experimental results show that the designed capacitive grating encoders accord with the predetermined technical indicators, the low resolution capacitive grating precision reaches 0.1°and the high resolution capacitive gating precision reaches 0.03°, and the 2 encoders both have good engineering practicability.