A reasonable and feasible nonlinear way was used to analyze whether surrounding rock steady based on monitoring result. Not only was determined potential fracturing section and influenced section, but also displacement of surrounding rock where all measurement points of three apparatuses located in 20 days was forecasted by qualitative analysis of R/S method and quantitative prediction of BP networks. Some problems, including whether potential dangerous section cracks, exact time of fracturing and crack depth, were investigated. Time space criterion on surrounding-rock fracturing was presented. It was shown that the section where displacement-time series satisfy Δ
