Directing against the phenomenon of hydroden canductivity sustaining to exceed the standard limit in steamwater system of China Power Guoha Beijing Thermal Power Branch Co

the causes have been analysed. It is believed that the main cause was due to the headwater being pollutted by organics. The main features of water and steam quality variations resulted from pollution of this kind have been pointed out and analysed. On this basis

whether the headwater to be pollutted by organics can be judged.