To ensure that electronic equipment in a complex electromagnetic environment can be normal, reliable work, research the grounding technology. On the basis of analyzing the advantages and disadvantages of single-point grounding, multi-point grounding, mixed grounding and floating grounding, consider and analyze earth potential distribution, according to different signal ground, analog ground, power ground, mechanically ground and reference ground, several typical grounding technology was applied comprehensively. The result shows that it is scientific and correct, which will give the reference for concerned personnel.