Abstract: The real-time detection algorithm of low-SNR small moving targets in image sequences is one of the key algorithms in imaging observation and guiding system.After analyzing various level methods of target detection,this paper proposes a developed dynamic programming(DP) algorithm in image SNR increasing and target pre-detection phase.Enhancements are achieved by performing exponential decay energy accumulation and adding the directional weight operation preceded to DP.The method has high detection probability and low false alarm probability,low computation load and memory consumption and is easy to implement in hardware and excellent real time performance.Experiment result and conclusion are given.