Abstract:. Cut patio construction was a critical process in the medium-deep hole or deep hole mining methods, which mainly includeds staged blasting or one-time grooved blasting. Cut patio wais essential in the medium-deep hole mining technology. The common method, the conventional raising, cage raising and climber raising method was usually used to construct the cutting patio, which has great safety risks and low excavation efficiency, which seriously affects the mine production.It is usually constructed using the conventional raising, cage raising and climber raising method, which has significant safety hazards. The excavation efficiency of these methods is comparabley low, which seriously affects the safety and efficiency of medium and deep hole mining methods. To solve the above problems in recent decades, scholars achieved rich theoretical results and practical experience by studying mine blasting technology. In recent years, Sanshandao Gold Mine hads researched downward sublevel filling mining with medium and deep hole blasting. This research iwas currently facing the problem of cut patio construction under the backfill roof. This study demonstrated a one-time grooved blasting method fitting the backfill roof condition and its application. By comparing the characteristics of the straight-hole cutting method and the blasting crater method, the straight-hole cutting method was selected for the cut patio construction. By calculating blasting parameters, the diameter of the charging hole iwas Φ65mm, and the diameter of the compensation hole iwas Φ110mm. The distance between the charging and empty holes iwas 0.3m, which couldan meet the requirements of blasting compensation space and free surface. In consideration of the surrounding rock stability conditions, a nine-hole cutout method was selected, containing 29 holes, where the cutout hole was designed with 1 central charging hole, 12 empty holes as compensation holes, 4 auxiliary holes, and 12 peripheral holes, after determining the blast hole plugging length, explosive selection, charge structure, differential time, detonation sequence and other process parameters, an in-situ industrial test of cut patio construction was carried out. The industrial test showeds that the one-time grooved blasting plan for patio construction iwas feasible. The blasting rock particle size is uniform with no large blocks and excessive powder, the blasting disturbance is minor, and the blasting patio dimensions meet the design requirements. Overall, this test provideds experiences and a reference basis for other one-time grooved blasting technical applications with similar conditions.