Tracking-Learning-Detection(TLD)tracking algorithm is a novel long time single-target tracking algorithm. It can learn object features quickly and track effectively with very little prior knowledge given. However,the tracker in TLD tracking algorithm selects the target feature points uniformly each time,which cannot ensure that each of the feature points can be reliably tracked. To solve this problem,an improved TLD algorithm is proposed,based on key feature point detection. The proposed algorithm can ensur...