Abstract: The roof is cemented filling body in underhand drift cut-and-filling stopping, and its stability is the key to safety mining of deep zone. Roof stability can be improved by distributing reinforcement in the filling body. Failure mechanism of the roof filling body was revealed through the result and the analysis of the monitoring data from the similarity simulation model test of lateral and longitudinal reinforcing pattern of the filling body. The reasonable reinforcing pattern was put forward to improve the stability of the roof and to ensure the safety mining.