A method to measure ice-water two-phase flow was proposed by using an Electrical Resistance Tomography(ERT). An ERT system was designed and the calculating method for phase fractions was explored based on imaging technology. Firstly, the principle of ERT system was introduced, and the design scheme for the ERT system with 16 electrodes was proposed, then a Linear Back Projection (LBP) image reconstructed algorithm were given. Furthermore, the analyzing methods for measured data of ERT system were presented and applied them to the identification of phase distribution and the estimation of phase fractions. Finally, several experiments were performed to verify the applied feasibility of the ERT system to ice-water two-phase flow measurement. The experimental results show that the ERT system can be used to obtain the positions of ice column within a tube in water and their movement sates in real time and can reflect the phase distribution of ice-water two-phase media intuitively. The relative sizes of the ice column can be obtained by the ERT system and the error of phase fractions are 6% and 2.8%, respectively. The research results prove that the ERT system can monitor the transportation process of ice-water two-phase flow on-line with higher measuring accuracy.