Under the tide of information economy, IT (information technology) capability greatly influences the ability of organizations to adapt to changes, and thereby to improve and preserve organizational task performance in the dynamic and complex business environment. This paper try to analyze the structure of IT capability from dynamic and routinebased perspective. According to the dynamic capability theory, IT capability can be mainly divided into two levels: IT operational capabilities and IT dynamic capabilities. The IT operational capabilities are indeed various sets of IT operating routines, while the IT dynamic capabilities are indeed IT strategic routines. We take the IT routine as a basic unit of analysis, and depict a micro-interpretation of IT capability.