As smart high-voltage equipment is the basis of smart substation, the research on the integration of primary and secondary equipments has become the key point of the implementation of smart high-voltage equipment. The integration situation of primary and secondary equipments in smart substation is analyzed, as well as the application integration principle of sensors and intelligent components is briefly discussed. Then, the integration optimization scheme is proposed for sensors, intelligent components, electronic transducers and main primary equipments that cover transformers, breakers, gas insulation switchgears (GIS), based on the actual engineering standards and the prospect of development trends. The intelligent components are congregated and connected to the primary high-voltage equipments through sensors and electronic transducers, which makes the high-voltage equipments possess intelligent characteristics such as digital measurement, networked control, visiable condition, function integration and information interaction, therefore, the long-term physical form and function promotion of smart substation will be improved in future.