By means of exposing the internal relationships between open Grid service architecture and pervasive applications, the fundamental theories and common methods of using transient Grid services to support pervasive computing are put forward. This paper shows how to construct standard interfaces, abstract basic functions, deploy runtime environment, integrate application systems and design transient services in engineering practice. The research background is a tax Grid engineering of services-oriented architecture which is described in detail. Experimental results show that this method is of simple, efficient and good at security, and transient Grid services can be used at all times and all places providing satisfied flexibility and adaptabilities to clients.