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In order to measure the dynamic radius of precision centrifuge effectively, this paper proposes a fixed point and position measurement method based on the benchmark, and use the capacitance micrometer, 24 bits high-precision PXI data collection card set up a dynamic radius test system; In the process of test, uniform angular sampling the dynamic radius data of the centrifuge first, and accreting extraction the local date of precision centrifuge platform edge, then the dynamic radius can be calculated by comparing the local date between different speed point to point. The uncertainty evaluation of the measurement results show that the proposed test method can achieve high accuracy of precision centrifuge dynamic radius measurement, and the accuracy of precision can reach to 0.085 μm.