This paper explores how to detect the viscous force of dark matter fluids. In a microscopic environment like the Earth, the ideal measuring device is the gravitational constant measuring device. However, although the order of magnitude of the viscosity force of dark matter fluid is equivalent to the gravitational constant, due to the symmetry arrangement of the gravitational constant Measuring device itself, the influence of various external factors including the viscous force of dark matter fluids has also been eliminated. Of course, The gravitational constant measuring device used in a general physics laboratory may not be accurate. It requires sophisticated professional equipment to complete. In addition, the direct measurement with other devices is not very good. The main thing is that the accuracy requirements are higher. In the interstellar range, the use of artificial satellites and spacecraft to make measurements may also be affected by gravity, and there are also some key problems to solve. In order to solve the above problems, this paper proposes a method that uses the principle of superconducting diamagnetism to balance pendulum, effectively eliminating the problem of symmetric placement of pendulum.