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In this paper, based on fuzzy proximity data fusion algorithm, the algorithm of multi-sensor high precision data fusion for mobile robot is studied. The estimated value and the measured value are fuzzy, and the fuzzy lattice close degree is calculated. In the measurement，weight of each sensor is described through the lattice close degree, and fusion results are gotten according to the fusion formula. The proposed algorithm makes the availability of data in robot navigation multi sensor measurement improve the universality, reliability and stability of measurement.