To investigatethe influenceofcapacitanceon the mass sensitivity ofquartz crystalmicrobalancesin oscillating circuits, an equivalent circuit model impedance analysis method for oscillating circuits was proposed. Firstly, an equivalent circuit model was established to analyze the relationship between impedance and frequency, and the corresponding relationship between capacitanceand masssensitivitywasrevealed. Secondly, multiphysicsfield coupling simulation experiments were conducted, and the influence of capacitance on its mass sensitivity was explored. Finally, the experimentalsystem platform wasbuilt, and the quality sensitivity experimentwas carried out. The resultsindicate thatparallel capacitors have a relatively smallimpact on their mass sensitivity. The mass sensitivity of the 1.01 pF capacitorin series is increased by8.01× 10- 2 Hz/ng, while the mass sensitivity of the 15.84pF capacitor in series is increased by1.49× 10- 2 Hz/ng. This conclusion helps to better understand the influence of capacitance on the mass sensitivity of quartz crystal microbalances, providing strong support for the portable and miniaturized design of such sensors.