Abstract: The hybrid event bed represents a deposit left by hybrid flows or transitional flows between turbidity currents and debris flows. The identification of hybrid event bed is a discovery in sedimentology. Hybrid event beds were commonly found in deep-sea plains, margins of deep marine fans and deep lacustrine basins. Shallow marine hybrid event beds have not been reported. The study took hybrid event beds from the middle East China Sea Shelf and the Taiwan Strait as examples, documented their sedimentary characteristics, reconstructed their sedimentary processes and discuss their origins. Based on geological settings and sedimentary features, this study suggested that intra-shelf failures and hyperpycnal flows were important triggers of deltaic/shelfal hybrid event beds. The debris flow division can be divided into two sub-layers, resulted from vertical stratification of the debris flow or longitudinal segregation. The study proposed that not all hybrid event beds were from deep marine systems, and hybrid/transitional flows were key downslope sediment transport mechanisms in shallow water.