Traditional Pt thin film resistance thermal sensor is easy to be damaged by erosion, which acts as the main limit to improve the efficiency of heat transfer measurement in shock tunnel. This paper is trying to find a method for developing the antierosion property of Pt thin film thermal gauge, with 0.06 μm chromium film as the backing film and 0.2 μm silica film as the protective film, samples of threelayer and two types of twolayer film sensor are made for test. The effect of chromium film and silica film for the resistancetemperature coefficient is analyzed, the numerical computations are taken to simulate the heat transfer process of singlelayer and threelayer film model of the thermal sensor. The results show that the silica film has little influence on the heat transfer measurement in shock tunnel. The experiments are specially carried out for comparison and validation, which indicates the reliability of the new sensor measurement result and the progress on durability and accuracy of measurement.