Abstract: Rock falls are influenced by a variety of factors and inherent uncertainties.Investigating potential disaster zones and distinguishing varying degrees of impact can provide critical data for disaster prevention and control.This study focused on the dangerous rock masses in Neizhuangtun，Nanning City，Guangxi.A 3-dimensional model was constructed using a fusion of oblique photography and nap-of-the-object photogrammetry modeling technology to accurately capture the structural and characteristic information of the rock mass.Through 3D numerical simulation，the movement path，process，real-time kinetic energy，and bouncing height of the dangerous rock masses were analyzed.Based on the simulation results，a method of dividing the potentially impacted areas was proposed.The findings indicated that the fusion modeling technique significantly enhanced the visibility of detailed features in steep mountainous regions，facilitating the accurate extraction of simulation parameters for rock movement.By analyzing multiple simulation results，the potential disaster risk zones were identified.The proposed method for dividing the affected areas enables a quick and easy division of potential disaster zones.The outcomes of this study provide insights for the investigation of high and steep dangerous rock masses.