Abstract: The concept Zhong Tai (a.k.a. Middle Platform), derived from the era of big data, has attracted the attention of more and more enterprises and institutions. The application of middle platform will play a transformative role in the digital humanities infrastructure. Various middle platforms have emerged, such as data middle platform, business middle platform, algorithm middle platform and technology middle platform. As an important type of institutional digital assets, images have been locked for a long time, and the utilization of these resources is extremely low. The proposal of the International Image Interoperability Framework (IIIF) has opened the door to image resource sharing and reuse. Based on IIIF framework and semantic technologies such as linked data, ontology and graph database, this paper puts forward the system framework and implementation plan of image middle platform in digital humanities. Image resources from different sources are gathered in the middle platform in real time, and image interaction and intelligent connection can be realized through image resources reorganization, content, and semantic annotation. The proposal of image middle platform aims to break the information island of image resources and can be used as the infrastructure of digital humanities to provide solution for the in-depth application and research of image resources.