The information technology paradigm shifts to smart service environment, as ubiquitous technologies are used in the latest industry trend. The major features of ubiquitous smart service are high dynamism and heterogeneity of their environment and the need for context awareness. In order to resolve these features, it is necessary to develop middleware that meet various new requirements. This paper designed middleware on ubiquitous smart service for enhancing the safety and reliability to city gas environment in Korea. The object of this paper will support cornerstone in order to construct the framework of intelligent infrastructure and service for autonomic management.