Abstract: To meet the requirements of an embedded real time system the functions provided and the system implementation principle of the Mach system must first be known. Through an analysis of the initialization of the Mach kernel, the model of the Mach system management and the internal management mechanisms and policy lying at the base is made clear. The system can then be tailored to form a usable embedded and tailored real time oprating system platform. The system is seen to be flexible and portble.