Abstract: Aiming at the interphase flashover problem of ice-covered transmission lines when galloping in turbulent stochastic wind field, we proposed an interphase flashover probability evaluation method of multi-phase multi-bundled ice-covered transmission conductors. Firstly, the stochastic wind load of ice-covered transmission conductors galloping in turbulent stochastic wind field was generated, and the galloping response in turbulent stochastic wind field was simulated by combining the finite element model of multi-phase multi-bundled ice-covered transmission conductors. Secondly, the failure criterion of interphase flashover of multi-phase multi-bundled ice-covered transmission conductors was constructed by an equivalent extreme value distribution method, and a probability evaluation framework of interphase flashover of multi-phase multi-bundled ice-covered transmission conductors in turbulent stochastic wind field was developed based on a probability density evolution method. Finally, an example of a single-span three-phase four-bundled ice-covered transmission conductor was analyzed. The results show that, (1) the results of interphase flashover probability evaluation of transmission conductors in different relative positions are obviously different, and compared with the steady wind field, the peak position of interphase flashover probability density curve of transmission conductors in turbulent stochastic wind field moves to the left, and the peak value is obviously reduced; (2) with the increase of turbulivity, interphase flashover is more likely to occur when the ice-covered conductors galloping in the turbulent stochastic wind field; (3) with the increase of average wind speed, the probability of interphase flashover of the ice-covered conductors first increases and then decreases, and the probability of interphase flashover of conductors in different initial wind attack angles is obviously different.