LM algorithm was introduced to the training process of a BP neural network and a LM--BP neural network model was established aiming at the defects of slow convergence in the train- ing process of the traditional BP neural network. The LM--BP neural network model was applied to the breakout prediction in the continuous casting processes, and it was tested with the historical data collected from a steel mill. The feasibility and the validity of the model are verified by the results with the accuracy rate of 96.15% and the prediction rate of 100%%针对传统BP神经网络在训练过程中存在收敛速度慢的缺陷，将LM（levenberg marquardt）算法引入到BP神经网络的训练过程，建立了LM—BP神经网络模型，并将其应用于连铸过程中的漏钢预报系统。结合某钢厂连铸现场历史数据对系统进行了测试，测试结果以96．15％的预报率及100％的报出率，验证了基于LM算法的BP神经网络连铸漏钢预报方案的可行性和有效性。
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