Abstract: On the basis that the distance of two lines in different planes is the association degree,a method of data association based on analyzing possible matrices is proposed.The feasible matrix is established,and the association pairs of candidates are reduced by analyzing the possible matrix,and the correct pairs of association are achieved by 2-D assignment.Simulation results showed that the method proposed has the same correct association percentage as the 2-D assignment,with less computation time in the condition of missed detection,false alarm and dense environment.