We investigated the effect of bubbles on the flow pattern of ice slurry. We observed the ice slurry containing bubbles flowing in the horizontal pipe, changing the flow velocity, IPF, and pipe inner diameter as parameters. As a result, it was found that the flow pattern was homogeneous flow under the high flow velocity and high IPF condition. As the flow velocity and IPF decreased, the flow pattern became heterogeneous flow and intermittent flow. In the flow of ice slurry with bubbles, the transition from heterogeneous flow to homogeneous flow easily occur, comparing with that without bubbles. We suppose that this is the effect of the repulsive force between the bubbles adhering the ice particles in the ice slurry. Moreover, it was found that the effect of bubbles became larger in narrower pipe. It can be said that the flow pattern of ice slurry with bubbles is likely to be homogeneous flow when IPF is high and pipe diameter is small, because the effect of repulsive force becomes larger.