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Aiming at the shortcoming of traditional “L formula method” and “average method” not sufficiently use measurement data and not consider the error influence, this paper advances real-time data fusion method based on multi angle measurement of photoelectricity scout instrument. Under least squares rule, building networking fusion model of photoelectricity scout instrument, pays more attention to the problem of initial value choice of appraised parameter, determination of weight coefficient matrix and fusion precision. By means of simulations and analysis, it has been proved that this method improves the precision and real-time, and compares and analyses the fusion effect in situation of different station distribution quantity. Finally, draws the conclusion of choosing principle of initial value of appraised parameter, calculation principle of weight coefficient matrix and number of station distribution being proper.