This paper presents a method of license plate character recognition based on the combination of Zernike moment and wavelet transformation features. CPU, DSP and other large power integrated circuits in the dynamic burnin test, its shell temperature rapidly increased, unable to remain the temperature for required, lead to burn in test can not be in strict accordance with the requirements. For this reason, this paper designs the automatic temperature controller of high power IC dynamic, Including temperature acquisition, fan automatic control, and display circuit, so the device shell temperature can automatically control within a certain temperature range through the fan. And trying to validation the test method according to GJB 548B. The test results show that, the shell temperature control is accurate and effective(such as 85-90℃, the temperature interval can be set free, the display precision: 0.1℃), and the temperature display real timely.