Abstract: The reliability of the flood control capacity of river levee can reflect the qu antitative relation between the designed maximum water level of flood control fo r the levee and the actual water level in flood season.The risk analysis of the flood control capacity for river levee is conducted by a stochastic variable met h od.The definition of reliability and the risk for flood control capacity,the mo del and computation method of risk analysis are given.And as an illustration,the risk levels of flood control capacity for some reaches are computed..