[Objective] Studying the characteristics of motion and evolution parameters of debris flow induced by glacier lake outburst floods(GLOFs) in order to provide countermeasures for debris flows prevention of this type. [Methods] Base on flume tests, the formation and evolution of debris flow due to moraine lake outburst floods were studied. [Results] The debris flow evolved from GLOFs was attributed to hydraulic reasons, the forming process could be divided into 5 phases. According to unit weight of water-sediment flow, the evolution process of debris flow could be summarized by successive sediment-laden flow, debris flow, sediment-laden flow. Correspondingly, The grain sizes of debris flow evolved from silts to gravels, and to silts in sequence. The outcomes from different sets of the test also showed that the grain sizes of the debris flow positively correlated to the unit weigh of the debris flow. [Conclusion] The motion processes of debris flow depend both on the hydraulic power of the GLOFs and on the grain sizes of bed materials.