We present a CPU resource broker model with a new admission control at a single resource level. The admission control supports advance reservation as well as immediate reservation. By separating brokerage part from scheduling part, we can obtain fast and constant response time of brokerage requests for resource reservation, modication, allocation, and release. 1 Introduction In recent years, a lot of researches have been done on resource reservation schemes. The reservation models are mostly concentrated on immediate reservation where the reserved resources are scheduled immediately. However, immediate reservation scheme has a limitation that its admission decision is made based on the resource availability at hand. For compensating immediate reservation scheme, advance reservation scheme has been introduced, for the client to make a reservation for resources for the future resource usage. The client species time parameters to request advance reservation: start time and duration. O..