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The urban ecological space network is the key link to the natural environment and ecosystem, which is also the foundation for maintaining urban ecological security. In the current urbanization process, the core ecological planning based on the central urban area ignores the dynamic changes of the space between nature and the city, which leads to the incoordination of the ecological environment of urban and rural human settlements, and the method and theory of ecological network simulation and analysis are still in development stage. Taking the construction of the ecological space of Tangshan City as the starting point, based on the morphological spatial pattern analysis method (MSPA) and the minimum cumulative resistance model (MCR) to identify the city’s ecological sources, and the potential ecological corridors between the ecological sources were extracted, combined with gravity the importance of corridors was quantitatively analyzed and the ecological space network of Tangshan City was constructed. The results showed that the extraction and identification of ecological sources was an important node in the construction of urban ecological network. Through identification and analysis, there were 33642 urban ecological sources, covering an area of 245674.52hm2, and mainly distributed in the northern mountain protection area, the central forest ecological protection area and the southern wetland protection area, the landscape types were mostly grassland and woodland, followed by water bodies. By quantifying the importance of landscape elements to the ecological space through patch importance index and other quantified importance, totally 30 important ecological sources were identified as key nodes of ecological corridors. Based on the minimum cumulative resistance and gravity model, totally 435 potential key ecological corridors were calculated and constructed, accounting for 51.21%, 30.74% and 16.46% of grassland landscape, woodland landscape and water landscape, respectively. In addition, the ecological forces and the suitability of the corridors between the source areas were significantly different. The interaction force between the sources 14 and 17 was 14562.77, and the interaction force between the sources 2 and 21 was the smallest of 1.06. Among them, source area 25 (Douhe River Basin in Kaiping District) and source area 18 (Qinglongshan Provincial Nature Reserve of Luanzhou City) were the key ecological source areas for the ecological exchange between the north and the south. In the future work, the protection and management should be focused on. The research result can provide effective support for land space planning, ecological space construction and ecological protection red line control in Tangshan City, and also can provide reference and demonstration for similar regional ecological protection management and construction of ecological space network.