The embedded systems have high requirements for the operating system's reliability,real time,and safety. The microkernel operating system fits the requirements well. Therefore the means of applications of microkernel will play an important role in the embedded applications. In this paper,analyze the structure and the principle of L4 microkernel in detail. On this basis,describe the general approaches to develop applications based on L4 microkernel. At the same time,an application example of detecting and pr...