Recent advances in wireless network and the mobile computing devices are affecting how software deployment is being performed. Therefore, to the component-based applications, the deployment of the components should be suited to the user needs, the resources of the terminal and the surrounding environment. Usually we use the component-based middleware to deploy the components, however, the existing component-based middleware do not take charge of the context information. In this paper, we put forward a context-aware middleware for the just-intime deployment of the component-based applications supporting the context-aware adaptation. In this middleware we provide a set of components being able to collect and analyze the context information and when relevant changes occur, the context-aware components will be notified to apply its adaptation process dynamically. Furthermore, the context-aware infrastructure is separated from the context-aware applications better so as to make the deployment of the context-aware components to be more transparent.