How to accurately describe landscapes spatial features and construct the 3D real-scene model is a new topic in the field of digital landscape. The maturity of UAV oblique photography and 3D laser scanning technology has brought new opportunities for the digitalization of landscapes. In this paper, UAV oblique photographic equipment and Smart3Dcapture 3D modelling software were used for 3D real-scene modelling of existing sites. Data mending was performed for the near surface layer space in key section using a 3D laser scanner, to generate a comprehensive spatial 3D model of data and achieve precise spatial cognition. Qingliang Mountain Park in Nanjing was taken as an example to extract and analyse landscape spatial features from three aspects of data acquisition-modelling-spatial analysis. The feasibility of applying UAV oblique photography technology and 3D laser scanning technology in 3D real-scene modelling of small to medium scale landscape architectures was verified by this study, and a set of research methods for site modelling and cognition was constructed.