In　the　process　of　embedded　systems　modeling　and　performance　evaluation,　the　performance　indicators,　such　as　average　delay　and　CPU　occupancy　rate,　are　often　need　to　be　analyzed　and　evaluated.　In　this　paper,　the　method　for　performance　evaluation　has　been　proposed,　and　the　library　function　for　performance　evaluation　based　on　SystemC　language　has　been　designed.　The　library　function　is　designed　for　evaluating　performance　parameters,　calculating　expectations　and　confidence　interval,　and　terminating　the　simulation　when　the　performance　indicators　meet　the　accuracy　requirements.　In　this　paper,　the　performance　evaluation　of　embedded　speech　recognition　systems　by　using　the　library　function　and　the　method　proposed　was　introduced　in　detail.　For　validating　the　correctness　and　practicality　of　the　library　function　further,　the　library　function　has　been　also　used　in　the　performance　evaluation　of　wireless　AP　systems,　as　well　as　in　performance　evaluation　of　complex　embedded　systems　based　on　SystemC.　It　is　of　great　value　for　extending　the　library　of　SystemC.