Abstract: During the on-site application process, it was found that traditional cable sheath cross-linking grounding boxes take an excessive amount of time to open and close. The article analyzes the principle of abnormal circulation caused by water ingress into a cross-linking box through a case study of water ingress on site. To address this issue, an improved design is proposed, modifying the connection between the box cover and body by incorporating a buckle structure to enable quick opening and closing, effectively reducing the probability of water or moisture entering the cross connected box.