The deformation caused by grouting around mine shaft is monitored with a reasonable scheme and the monitoring data are analyzed by chaos theory to judge the chaos characters.The analysis of chaos shows that the correlation dimensions are 1.3282 and 1.4587,the embedding dimensions are all 3,and the biggest Lyapunov index areall bigger than zero for the time series of two monitoring points.So the time series of two points are chaos and can be predicted by theory of chaos.It is found that the forecasting precision is infected by the interval of time series.The precision of time series model whose interval is 10 day is best while initial time series is better,the interval of 7 day isworst.