This paper explores the effects of dark matter fluids on galactic matter within the confines of the solar system. In this way, we can explore the possible effects of dark matter fluids on a smaller scale. The effect of this dark matter fluid in the solar system is mainly the tilt angle of the rotation of the planet or star. Because even in very large-scale cosmic scales, conservation of angular momentum can always be established, so the change of angular momentum has become the most sensitive parameter of galactic matter to external influences. Through the analysis and calculation results of this paper, it is shown that when there is a high-speed relative motion between galactic matter and dark matter fluid, the viscous force of dark matter fluid will cause changes in the orbital or rotational angular momentum of planets or stars like gyroscopes affected by gravity. This may be an important reason for the tilt of the eight planets in the solar system, as well as the sun itself. The calculation results according to the model in this paper show that the calculation results are basically consistent with the actual observed precession period of the major planets and the sun. A few inconsistencies can be corrected by external factors such as asteroid impacts. The significance of this study is to provide an important way to detect the existence of dark matter in a smaller galaxy range, and also estimate some important parameters of dark matter fluid, such as the flow speed of dark matter fluid and the viscosity coefficient of dark matter fluid.