Performance indexes of the embedded real-time operating system are not isolated but interacting with each other. Two sets of elements aiming to describe the relationship between the dependencies among performances are defined in this paper. Based on this, a two-indicator-set test model of operating system is proposed which divides the indicators set of operating system into affection and evaluation sets. Based on the two-indicator-set test model, time of tasks switching and interrupting response are measured in a practical way. The effectiveness and objectiveness of the two-indicator-set test model are verified by the process of generating case tests and results of final experiments.