This paper presents a simple but efficient path capacity model which can reinforce the theoretical foundation of the wireless mobile computing. Based on the exiting node-oriented analytical model, this paper extends the research object from the node to the path, and proposes a path-oriented capacity analytical model with pipeline queue theory. This model can further be used to explore the transmission capacity of the multi-hop wireless networks, such as MANETs and sensor networks. By using the simple capacity computation equation, network applications can adjust their optimum parameters adaptively, and the QoS routing algorithms can be designed more efficiently.