1. Introduction The reference electrode is one of the cathodic protection system is an important component. It can be used to measure the potential of the protected structures, but also as a source potentiostat controlled automatically. 2, buried a long-term application of saturated copper sulfate reference electrode (1) Accurate monitoring of cathodic protection status for the sacrificial anode protection potential measurements. (2) In the impressed current cathodic protection system for the automatic control of a stable source for buried pipelines and underground metal structures cathodic protection engineering. (3) can be embedded in the need to monitor the position but can not enter. Such as: large-scale container bottom center position; you can not be close to underground bunkers and chemistry between the position of the tank; urban road under the pipe network. Can be pre-buried during construction, long-term use. (4) pipeline cathodic protection telemetry signal source. 3. Long buried saturated copper sulfate reference electrode major long-term technical indicators buried copper / copper sulfate reference electrode saturated main technical indicators critical current density: + 38 ~ -10uA / cm2; potential accuracy: ≤ ± 10mV; electrode Design Life:> 10 years; the open circuit potential: +316 mV (V, CSE). Continue to use the material as a portable 4. Model Specifications for the environment shapes the life of copper / copper sulfate reference electrode saturated CCT complement cylindrical copper sulfate, the water and soil for field measurement of copper / copper sulfate reference electrode saturated MCT- Ⅰ tank shape > 5 soil medium copper / copper sulfate reference electrode saturated pitcher MCT- Ⅱ> 10 buried electrode with a long life