Abstract: In recent years, a number of deflagration accidents have occurred triggered by dangerous chemicals leaked into the urban drainage culvert and cable channel from the pipeline, mainly due to unreasonable arrangement of dangerous chemicals pipeline and urban underground facility and inadequate inspection and maintenance of such pipeline. The current technical specifications include no requirements for the layout of dangerous chemicals pipeline and urban underground facility. Urban expansion makes many dangerous chemicals pipelines trapped, which constitute a huge threat to urban security. Combing the characteristics of buried dangerous chemicals pipelines, this paper elaborates the technical concerns when such pipelines are arranged cross and close parallel to urban facilities, so as to provide some references to the pipeline operating companies and municipal pipe network management authorities.