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The system performance is often limited by phase noise in the field of space measurement and control. Accurate measurement of carrier phase noise is particularly important.PN9000 phase noise measurement system can be directly applied to accurately measure phase noise, it has the advantages of high sensitivity, maintenance, fast test and so on. As the frequency of space measurement and control field is increased, the frequency measurement range of PN9000 basic configuration can not meet the test requirement. To meet the requirement of expanding frequency range of PN9000 phase noise measurement system, the two expanding frequency range methods were proposed that respectively based on phase detector (fundamental form) and IF phase detector, and the theoretical results with experimental data were compared. According to the experimental results, the intention of expanding frequency range can be realized by using any one of the two methods, but the different characteristics in system floor phase noise and costs are showed. The two methods and experimental data in the paper can be referred for expanding frequency range of PN9000 phase noise measurement system and choosing suitable accessories.