Abstract:the data association model of multidimensional assignment did not consider the position estimation error in association cost,this paper proposed a Data association algorithm for passive sensor based on position estimation uncertainty. Rayleigh entropy is used to establish probability density function for the measurement and pseudo measurement to accurately describe the relationship,and describe two different probability density functions different,and the validity and superiority of this algorithm is test by simulation experiments. Simulation results show that,compared with the classical data association algorithm,this proposed algorithm can improve the rate of correct data association,and has higher practical application value.