Abstract: The paper establishes neural network-time series combined model;the trend term is extracted by the neural network,and random items are fitted by time series.Various factors leading to slope deformation are taken into more comprehensive consideration;it overcomes the defects of single models Combined with tracking algorithm,the southern slope and western slope of Dongming coal mine were analyzed through the combined model.Then,the result was compared with fitting results of single time series model and neural network model.The result shows that combined model has better fitting and forecasting ability in slope system analysis.