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Aiming at the internal temperature measurement of the sealed objects, a technique based on X-ray radiography with the thermal spiral bimetallic component to obtain their interior temperature was presented. Firstly, the image of the bimetallic component that was put into the measured object was captured by X-ray radiographic equipment. Then the region-growth method and the edge detection were employed to obtain the image feature of the bimetallic component. According to the shift-rotation invariability of Hu invariant moments, we found a good linear relationship between the first Hu invariant moments and temperature values through the established temperature models and experimental studies. Experimental results show that the given strategy is accurate and reliable. It provided a new approach for the interior temperature measurement. 