The foundation of slope stability analysis is the data acquisition of the deformation. How to obtain the data detection point directly and efficiently is the access to achieve real-time predict method to slope stability. By introducing the Trimble GX 3D laser scanning data acquisition method, road slope detection method is put forward. According to the scanner system and working principle of the implementation steps, the slope detection and data processing procedures are developed and present references to the slope detection. With specific engineering application analysis, the feasibility of such acquisition is verified.