Abstract: For expanding the scope of the key area defense reconnaissance and positioning the incoming target, on the basis of two-unit interactive measurement positioning algorithm, the relay measurement of the adjacent array units and passive measurement, coordinate transformation, data fusion were accomplished by the central processing unit. An algorithm based on array of electro-optics reconnaissance positioning system on air targeting was proposed. A model of an mn electro-optics reconnaissance array position on air target was derived, and the single target positioning simulation, verification and error analysis of 22 array element were accomplished with the help of MATLAB. Simulation results show that this algorithm can output the real-time data of the three-dimensional track and realize the positioning of the on air target. Compared with the theory of truth value, the absolute value of the average positioning error is less than 7 m.