The data association is a difficult point in the multi-target passive location. In order to improve the percent of correct association in the condition of multi-sensor and two sensors were in one plane, the method of data association based on the redundant information was proposed in this paper. Two sensors were adopted to get the pairs of association, if there were multi-target and two sensors in one plane, the third sensor was used to test the percent of correct association of each pair. The correct pairs of association and the false pairs of association were estimated. The method which was put forwarded was an intelligent dada association, which could use the redundant information of the third sensor selectively, and the simulation results showed that the method had higher percent of correct association.
