In the condition without change of channel boundary condition and disadvantageous weather factors, the ice -flood prevention regulation and water volume control are important means of decreasing ice -flood disaster. Safety flow of ice -flood prevention is one of the most important bases for ice -flood prevention regulation. Some preliminary exploration on method of solving safety flow of ice prevention has been made, by analyzing the characteristics of ice -floods, comparing the flow processes in the disaster and non-disaster years, exploring the formation and motion mechanism of the ice, and studying the carrying capacity under river ice. The research result of safety flow can be used as basic foundation in ice -flood prevention regulation.