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The present paper studies the stabilities of ice blocks in front of an ice cover based on experiments carried out in laboratory by using four types of ice blocks with different dimensions.The forces acting on the ice blocks in front of the ice cover are analyzed.The critical criteria for the entrainment of ice blocks in front of the ice cover are established by considering the drag force caused by the flowing water,the collision force,and the hydraulic pressure force.Formula for determining whether or not an ice block will be entrained under the ice cover is derived.All three dimensions of the ice block are considered in the proposed formula.The velocities calculated by using the developed formula are compared with those of calculated by other formulas proposed by other researchers,as well as the measured flow velocities for the entrainment of ice blocks in laboratory.The fitting values obtained by using the derived formula agree well with the experimental results.