Abstract: The ground connection of the light current system,mainly working grounding,aims to prevent electromagnetic noise and assures the equipment to work steadily and reliably.The fundamental method used to prevent electromagnetic noise is obtained through analyzing the birth and transmission of electromagnetic clutter interference and some related cases.With the development and application of modern electronic technology,it is inevitable that the electromagnetic compatibility must be solved.ZSRG and SRPP are effective grounding techniques that can prevent electromagnetic interference and make the light current system possess electromagnetic compatibility.