Aiming at the problems lying in the present fusion algorithms for hererogeneous sensors at different sites,a new data fusion algorithm is proposed for radar and IR sensors at different sites based on the accuracy of the distance measurement of radar and angle measurement of IR sensors.In the algorithm,a circle determined by the location of radar and distance measurement of radar intersects the line determined by the location of IR and angle measurement of IR.The intersection point is the location result.Comparisons of simulation results show that the new algorithm can improve the target location precision greatly.