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The dynamic radius affects the precision of acceleration outputted by precision centrifuge, it is a main technique parameter of precision centrifuge and should be measured accurately during the process of precision centrifuge design. Its value will be as compensation component to be added to the acceleration compensation mathematic model, then, the precision centrifuge can obtain acceleration value accurately. This paper introduces the dynamic radius test technique based on external reference, including multiple positioning data identification method of positioning platform, test system configuration and so on. The technique has been applied to the dynamic radius test of high precision centrifuge, the measurement results show that using the measurement technique, the standard deviation of the dynamic radius measurement is 0.21 μm, the measurement result satisfies the requirement of the high precision centrifuge technique indicators. 