Study on HBO's economic connection can not only promote integrated construction and coordinated development of city group, but also help sustainable development of resource-based city group. This paper, based on a case study on HBO city group, uses social network method to establish HBO's economic connection network, and measures its network density, centrality, and inner condensation sub-group. Results reveal that their economic connection is increasingly close and complicated, not high in network density compared with developed city group. Their economic development is asymmetric and imbalanced, but inside city group direct connection among each member is steadily increasing, which may form condensation sub\|group out of locality limit. 