Pocket park planning is an important tool for urban habitat enhancement, yet previous studies have not often considered pocket park network construction. In order to determine the spatial differences in the demand for pocket parks, this article adopts a systematic perspective and uses the built-up area of Harbin city as an example. It does this by extracting the existing green space network, evaluating the spatial suitability of pocket parks, and combining the two previous steps. The results show that the density of buildings and roads in the city are negatively correlated with the supply of ecological resources; there are differences in the demand for pocket parks among spaces in the built-up area. By comparing the current situation with the simulation, the designed network of 88 pocket park corridors will effectively alleviate the problem of green space shortage. In addition, from the perspective of the network system, we propose three strategies for constructing pocket parks for different spaces, providing a new approach to enhance the urban living environment and promote the harmonious development of humans and nature.