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The Aluminum thin film was prepared by thermal evaporation method. In the process of evaporation, it is found that Al thin film is Inhomogeneous. The thickness distribution of the Al thin film is distributed in the cosine curve. Therefore, the tungsten boat is moved from the Chamber center to the center by step, and the transmittance of the film is observed .The Luminance of Al thin film was measured by Luminance meter LS-100 to discuss the transmittance distribution of the Al thin film by different tungsten boat fixed positions. Results show that the uniformity was improved by move the tungsten boat,But when the position of the tungsten boat is moved over 2 centimeters, it makes the center too thin to make the overall uniformity worse.
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