Abstract: Kelvin dripping - water charge collector has attracted widespread attention as its potential applications.Its charge collector effect is affected by many factors，especially by the humidity of the environment. Thus it is a research hotspot on improving the charge collector effect in high humid environment. The traditional 　　Kelvin dripping-water charge collector is improved by optimizing its production materials，induction coil turns， dropping velocity，distance from dribbling nozzle to induction coil，dripping distance，etc.Experimental results show that the starting time of the improved Kelvin dripping - water charge collector is shortened significantly，and a relatively remarkable high electrostatic voltage is obtained in a high humid atmosphere up to 85%.

Key words: Kelvin dripping-water charge collector, humidity, charge collector effect