Aiming at the problem of detection and tracking of weak target under the complex environment, a dynamic programming method based on plot-track quality evaluation is proposed. The method combines the true echo characteristics of the target and the motion law of the target based on the traditional detection and tracking structure. In a single cycle, the concept of plot quality is put forward according to the target echo characteristics; during the cycle, according to the motion law of target, the possible target state is estimated. According to the Euclidean distance and azimuth equation between state estimation and measurement, a confidence factor is used to improve the indicator function combined with the plot quality. Simulation results show that the method can effectively eliminate the fake trajectory, reduce the calculation, enhance the probability of detecting radar weak target; and its structure is simple, easy to achieve in project.