Following the mission of digital protection of cultural heritages in the new era，this paper positioned the goal of digital protection of cultural heritages for permanent preservation and sustainable inheritance，and reviewed the development，maturity and innovation process of digital protection of Dunhuang Grottoes. It puts forward the research and development concept of digital key technology，which is led by science and technology，digital innovation and permanent preservation. The application concept of digital technology and its data achievements is put forward. The paper puts forward the concept of digital talent training，which includes innovation mechanism，collaboration and talent cultivation. Wish to establish a precious cultural heritage in the high quality digital archives at the same time，into a new development concept，inheriting the past experience，excellent academic，science and technology and art in one fusion，continuing to explore the key technology of digital cultural heritage，rich cultural heritage digital technology system，continually improving art connotation of cultural heritage，to better carry forward the cultural heritage of historical，artistic or scientific value.

The stone cultural relics represented by cave temples occupy a very important position in China’s cultural heritage. However，because the protection of such cultural relics is not only related to the cultural relics themselves，but also closely related to their rock mass and surrounding environment，which has become the most complex type of cultural relics protection. In recent ten years，new technologies such as laser scanning and satellite remote sensing have appeared in the protection and reinforcement project of grotto temple，which provides a technical guarantee for the digital and information development of its data acquisition. As a high-precision three-dimensional scanning technology，three-dimensional laser scanning technology is an effective means to realize the digital protection and utilization of grotto temples. By using three-dimensional laser scanning technology，this study takes cave 32 of Beishiku Temple as the research object. After collecting its point cloud data，it makes reasonable use of the point cloud data through modeling and using the point cloud and the model scanning software ReCap，quantifies the diseases of the cave temple by using the point cloud data，and marks and adds information to the diseases in the cave temple，Explore the method of visual management of disease information in grotto temple.

The 3D modeling method of high fidelity information is an important research content in the digital protection of cultural relics，which is of great significance to the display，research，and restoration. In this paper， a high fidelity information 3D modeling method for cultural relics was proposed based on the Niushi Buddhist monk statue in Lingyan Temple in Shandong Province. Firstly，3D scanning and multi-view 3D reconstruction techniques were used to establish the high precision geometric 3D model and high resolution texture 3D model respectively. Then，the high-resolution texture of the texture model was automatically mapped to the surface of the high precision geometry model through mutual registration and alignment of the two heterogeneous models，and realized the fusion of high precision geometry information and high resolution texture information. Based on mature commercial software and hardware， the cultural relics high fidelity information 3D modeling method proposed in this paper has the advantages of simple operation and low cost，which has practical significance for efficient digital archiving of cultural relics.