Low data stability exists in the measurement of the developed leather thickness gauge (MH-YD1). After studying the whole working principles and a comprehensive analysis of experimental results, we find the main factors. Which are the structural factors and the working principles of the capacitive sensor collected the displacement. Then, we put forward improvements. In hardware, we solve the effective contact between the static and dynamic film and the pivoting of the guide bar. Also including the instability of data displayed in software. Then the experimental data measured by using the improved gauge proved to have good stability.