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Visual tracking is an important issue of computer vision,TLD is an on-line visual tracking algorithmwith good robustness and high accuracy properties.However,the real-time performance of TLD is low for the largesize video sequences.In this paper,we study the most time-consuming stages of TLD,and then propose a parallelalgorithm based on CUDA.The experimental results show that the speedup of our algorithm reaches up to 2.59compared to TLD while maintaining the same detection accuracy.