Some of the research work which the authors have done on microkernel in the last 5 years are described in this paper. Three new algorithms have been proposed. The first algorithm combines task schedule and thread schedule algorithms together to improve the efficiency of the thread schedule system, it also provides a more fairness scheduling algorithm for microkernel operating system. The second algorithm is an enhanced copy－on－write algorithm, it combines copy －on－write and copy－on－reference algorithms together to make it more suitable on I386 architecture. The last algorithm is a new timing algorithm for microkernel operating system, it solves the inaccuracy timing problem which is caused by traditional timing algorithm running under the microkernel architecture.