Abstract: When gas turbines are operated under high humidity environments, the air intake filtration systems may experience rapid increase of resistance, which can seriously affect the security and economy of gas turbine operations, i.e. "wet-clogging". Based on the studies on the real case, the internal mechanisms of wet-clogging have been analyzed thoroughly in the paper. Furthermore, a passive preventive scheme by improving the water mist endurance and an active preventive scheme by adjusting the relative humidity and temperature of the inlet air were put forward respectively. According to the results from water mist endurance testing and compressor inlet bleeds heating (IBH), both approaches mentioned above are capable of resolving the issue of wet-clogging effectively.