In lunar circumstances, lunar dust has special properties such as conductivity, which can cause lunar dust to easily adhere to the surface of detection equipment. And this behavior will cause the equipment to fail to function properly and thus affecting the lunar exploration missions. According to the researches of lunar dust protection, in this article the passive protection technology of lunar dust is mainly analyzed. Firstly, the lunar-dust caused adverse factors and effects on detection equipment are analyzed. Then the mechanism of lunar dust adhesion is studied, and the theoretical basis of the two main forces that cause adhesion is discussed. Secondly, the main methods of reducing the adhesion of lunar dust particles are systematically explained according to different adhesion mechanisms, and the latest progress of the passive protection technology of the lunar dust is introduced in detail. Combined with the different protection methods, the method of testing the adhesion of the lunar dust is summarized. These studies lay the foundation for effectively protecting the surface of detection equipment from being affected by the lunar dust.