Abstract: Electro-thermal effect of carbon fiber reinforced cement matrix composites(CFRC) including the relation of maximum temperature rise to exerted power,the rule of temperature rise and drop was investigated.The results showed that the maximum temperature rise has a linear relation to the exerted power,the rise and drop curves of temperature can be expressed in formulas,and the larger the exerted power,the faster the temperature rise,which is referential to the application of CFRC in marine projects.