With the development of information technology, intelligent information technology has been widely used. And the intelligent algorithms are largely applied to the multi-sensors information fusion field. The three commonly used basic methods, i.e. weighted method, modified method and related realm method, work only aiming at the case of two partial joints, but do not work in the case of rather large scale system target association problems. In view of the target association problem in the air defense system, this paper presents a heredity-based multi-sensors multi-tracks associated algorithm by using which the multi-sensors multi-tracks associated problem is transformed into a multi-dimensional allocation problem, and gives out the concrete model, algorithm and solution steps for solving the problem. Simulation experiments are done to testify the correctness and validity of this algorithm, and the results show that the algorithm is of guiding significance for the realization of the application system.