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The uplink injecting and ranging performance of navigation satellite is an important guarantee of the service accuracy for satellite navigation system. A navigation satellite uplink injection and ranging performance test system is proposed in this paper. The core of the test system is the controlling and processing computer. The test system is combined with the special design of the reference frequency generator module, the reference time generator module, the injection signal generator module and general commercial instruments. The test system can real-time dynamically simulate scenarios that the orbital navigation satellite receive uplink signals from earth station. The performance of ranging and information generating and comparing can be completed. The test system is stable, flexible with high accuracy. Test software parameters can be modified to meet the new testing requirements, and so the test system is easy for upgrading. 