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Now the problems of ultrasonic thickness measurement include that precision is not high、measurement error is relatively large and the noise is relatively large.To solve these problems, cross-correlation algorithm can be used to improve the precision and reduce the noise jamming, in addition to improvements in hardware. Through the calculation of the thickness of The 30mm with fine thread iron standard test block and 1mm stainless steel test standard test block, the effectiveness and accuracy of the measurement is verified. The system runs steadily,detects thickness reliably and the application value is much higher in ultrasonic thickness measurement field . 