HDCVI adopts low-frequency coaxial high-definition modulation technology, which avoids the interference of high-frequency wireless electromagnetic radiation from the essence of the technical principle. Even in a strong interference source environment, HDCVI can still guarantee high-quality image transmission. Thirdly, in the actual construction, HD-SDI has strict requirements for wiring environment selection and construction methods, mainly for the high quality requirements of the installed cables; the requirements for midway connection are not allowed; the welding quality requirements for the connecting terminals ; installation path low radiation requirements, etc. These put high demands on the quality of construction workers, construction costs, complexity of installation and maintenance, and line layout design. The HDCVI technology follows the construction requirements and routing specifications of the simulated standard definition, and the ordinary weak current construction personnel can quickly deploy the high-definition monitoring subsystem.