In order to develop a model to predict the severity of contamination deposition which could take account of the effects of the meteorology

geometric parameters of insulators

and air pollutant

we studied the contamination deposition characteristics of post insulators by means of computanational fluid dynamics. Moreover

we analyzed the chemical composition of salt in pollutant on insulators. The results demonstrate that as the wind speed grows

the contamination on the bottom suface rises and remains about the 80% of the maxmium value

while the contamination on the top sufaces increaces first and then decreases. Moreover

the contamination deposition grows as the relative humidity gets bigger

but it will be less than five times of the value as the relative humidity is 30%. The chemcial composition of the salt contamination on insulators is uniform in the same region. At last

the model is verified with an example

and it is revealed that if the relief effect of rainfall is thought over

the predicted value will be less than four times the samples’ mesured value at its worst condition. The proposed new method of contamination prediction can be used for a reference for further researches.