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To satisfy needs of the cryptographic performance in high speed real-time communications, after researching the typical design of AES-ECB, an improved design of AES-ECB based on multithread technology is proposed. By dividing the intermediate iterative process into some sub threads, the running flow of AES-ECB is improved, and sub threads can be organized like pipelining. The performance analysis results show that the multithread design can increase about 0.46 to 4.27 times than the single-thread design in performance, and when the sub thread number is 12, the speed can achieve 520 Mbps at least, which is suitable for applications with high requirements on the en/decryption speed.