Abstract: Current PC networks provide natural distributed processing function, but lack power for processing larger tasks. We can develop an integrated operating system to solve this problem. Taking the Ethernet-like network, 3comethernet, as an example to explain the design strategies for the integrated operating system, this paper analyzes the necessary functions and constrained factors for realizing a secure and reliable kernel, and gives an overall design of the kernel. Finally, we assure readers of validity and correctness of the kernel.