Abstract: Blasting is an important process in open-pit mining and the analysis of spatial attitude parameters and safety warnings are essential for blasting safety and economy,so it is particularly important to investigate the solution of spatial attitude parameters for open-pit drill holes and their minimum free resistance distance blasting warnings. However,in practice,due to the natural geology and drilling process,some boreholes cannot be drilled in a straight spatial direction and deviate from the drilling track,forming arc-shaped boreholes. This paper proposes a method for solving the spatial attitude parameters of curved boreholes and their free resistance distance blasting warning based on inclinometer and UAV photogrammetry data,which shows that the method can accurately solve the spatial attitude parameters of curved boreholes and achieve free resistance distance blasting warning,which can provide technical support for the open-pit blasting industry. The study results show that the method can accurately solve the spatial attitude parameters of the arc borehole and thus achieve free resistance blasting warning,which can provide technical support to the open-pit blasting operation.