【Objective】The hundred-mile ecological corridor of the Songhua River is a diverse environment with abundant biological resources. Studying the construction and classification of its habitat network is crucial for enhancing regional biodiversity and ecological stability.【Method】Using the Songhua River Ecological Corridor as a case study, we first identified regional habitat types and assessed habitat quality using the InVEST analysis. We then pinpointed habitat sources, habitat corridors, and habitat nodes based on habitat suitability analysis for focal species and circuit theory, forming a comprehensive habitat network. Lastly, we classified the importance levels of sources and corridors based on current density.【Result】(1) The corridor features 23 habitat types; 44.31% of the areas are classified as having high habitat quality. (2) The habitat network consists of 82 sources, 147 corridors and 57 nodes. (3) Analysis of current density revealed seven primary habitat sources covering 484.82 km², primarily in large nature reserves, and 14 first-class habitat corridors totaling 7 560 meters, mainly along the main stream of the Songhua River, though the corridors are relatively short.【Conclusion】The habitat conditions in the Songhua River ecological corridor are generally favorable. However, attention must be given to ecological threats posed by rapid urban development. Effective strategies include classifying and expanding habitat sources, managing and enhancing corridor connectivity, and restoring and adding habitat nodes. These measures will optimize the habitat network and facilitate biological migration, providing essential “Stepping stones.”