Abstract: Cemented filling method has been widely applied. The theoretical and technical application achievements have been made in this field in many aspects. These study results are mainly targeted at specific research objects， but lack of studies on the overall demonstration and internal relationship of mining methods. Therefore， based on the concept of "synergistic mining"， the synergy in underhand slice stoping with cemented filling have been summarized and analyzed. Firstly， the synergy of the roof support system of cemented filling body in the layered mining is analyzed， the synergy between vertical reinforcing steel bar， trays， steel mesh and cemented filling body as the roof support systems is demonstrated， and the internal overall synergy as the roof support function is highlighted. The engineering application and effect of the support system are also introduced. Secondly， the block theory is applied to the road side stability analysis.The synergy between the direction of the layered approach， the mining sequence of the layered approach， and the top and bottom layered mining paths is discussed， illustrating the process of harmonious handling of factors that cause mining instability during mining and the collaboration among mining elements. It further discusses the good synergy and overall effect of the actual mining process. Finally， according to the specific conditions of fragmentation and instability of the surrounding rock on the upper wall of the ore body， an advanced guard filling scheme is proposed， and the mechanism of advanced guard filling to improve the roof stability of the stope is revealed through numerical simulation. Based on the above discussion results， it is further points that advance guard filling is in this layered mining process， and at the same time， it is considered to improve the protection for the next layer of safe mining. The essence is a "synergetic mining" concept to avoid subsequent disasters during the mining process. The above study results can provide some reference for the establishment of the cooperative theory and technical system of filling mining.

Key words: Synergistic mining, Downward slice stoping, Cemented filling, Filling body, Support