Abstract: The dynamic balance measurement system of the precision centrifuge is composed of four capacitance displacement measuring instruments mounted on the upper and lower measuring planes，a force-measuring sensor on the base and angle-measuring gratings．When in quasi-static state and the balance velocity state the first harmonic error is measured by five sensors respectively，the normal force upon the pedestal is measured by the force-measuring sensor，the vibration vector can be calculated by the output of four capacitance displacement instruments．Comparing the output of four capacitance displacement instrument to that of the force-measuring sensor，then the malfunction judgement can be given．Applying the redundancy technology and multisensor information fusion technology，the synchronized automated data acquisition，processing and malfunction warning is realized by computer．

Key words: Dynamic balance, Information fusion, Multisensor, Precision centrifuge, Vibration vector