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A new model based on the numerical electric field analysis has been developed to predict the flashover voltage of ice-covered HV insulators, under ac voltage. by analysing the electric field and combining the u-i and re-ignition characteristics of the arc, the arc propagation process and the flashover voltage of the ice-covered insulators under ac voltage can be obtained. moreover, the peak value of the voltage on the residual ice is calculated based on the electric field model, which can avoid the errors caused by the simplified residual ice resistance calculation methods in the mathematical model. the results obtained from the electric field flashover model have been compared with other mathematical and experimental results and got a great agreement.