Abstract: A kind of sacrificial anode cathodic protection system of reinforced concrete are introduced. This system consists of highly active zinc alloy sacrificial anode,conductive mortar filling material and composite protective sheath,which can be applied to cathodic protection of reinforced concrete intidal range zone and splash zone. Protective effectiveness can meet the requirements of relevant international standards. Monitoring system for cathodic protection of reinforced concrete structures in marine environment is developed. The system can not only effectively assess the protective effect of sacrificial anodes,but easily acquire cathodic protection parameters including polarization potential,self-corrosion potential,linear polarization resistance of steel bar,electrical resistivity of concrete,chloride ion concentration in concrete,environmental temperature for steel bar and anode current,etc.