The process of urbanization not only brings rapid economic and social development, but also causes resource and environment loss and ecosystem degradation, threatening the long-term stability of the regional ecosystem. Therefore, it is of great significance to construct regional ecological network to alleviate the negative ecological impact of urbanization and improve the level of regional ecological security. This study analyzes the goal of ecological network construction under the guidance of differentiation and the key points of ecological demand and ecological network construction in high-intensity urbanization areas. This study was based on the perspective of scale nesting and composite function, and Jiangyin City of Jiangsu Province was selected as the research area. On the one hand, it formed scale nesting ecological network with Taihu Lake area and Wuxi City; on the other hand, it took overall consideration of heat island effect, rain-flood regulation and landscape recreation service supply to construct compound functional ecological network and formed ecological network system of high-intensity urbanization area. The results showed that:(1) In terms of scale-nested ecological network, there were 4 core ecological sources and 26 conservation ecological sources in Jiangyin, and the total area of the two types of ecological sources accounted for 4.76%, mostly distributed in the north and middle of Jiangyin. There were 39 basic ecological corridors completely located within the scope of Jiangyin City, 11 Wuxi-Jiangyin ecological corridors and 3 "Jiangyin-around Taihu Lake" ecological corridors connecting with the external ecological sources of Jiangyin City, with uniform distribution on the whole. (2) In the aspect of complex function ecological network, Jiangyin had 11 complex function ecological sources, with a total area of 4755.31hm², accounting for 4.78% of the city area. They were mainly distributed along the Yangtze River in the north and Dingshan and Huashan in the middle. There were 88 functional ecological strategic points with multiple functions. Three types of single ecological function network elements were extracted, including 31 ecological sources for heat mitigation, 51 ecological corridors for heat mitigation, 26 ecological sources for rain-flood regulation, 52 ecological corridors for rain-flood regulation, 56 recreational resource points, and 85 landscape recreational corridors. (3) Based on the ecological network system composed of scale nested ecological network and composite functional ecological network, suggestions on ecological protection and restoration measures were put forward. The research provides ideas for the construction of ecological network in high-intensity urbanization areas, and can be used as reference for the restoration of territorial and spatial ecology in relevant areas.