In the localization process of multiple passive sensors, constraint formulas of trigonometric functions are given by means of the relationship about sensors. Measurement errors can be obtained by optimization method. Most cross points do not overlap because the results are the local optimal or approximation optimal. Not only the sensor’s performance but also the radial range influences the target localization error, so the two factors are considered in this paper. The sensor’s performance and radial range are regarded as parameters. Each cross point weight is calculated, weighted sum of cross points is given, and then better localization results are obtained. Simulation results show the modified algorithm is efficient.