In order to increase the accuracy of wall temperature measurement of inlet in the anti-icing test, the effect of heat transfer to the measurement result should be considered. The heat transfer model of the measurement scheme is constructed, and the measured wall temperature error by heat transfer is calculated. The result shows that in the environment of large temperature difference and strong convection, the measured wall temperature error is greater, so that the measured temperature is lower. Other conditions which wall temperature measurement error exists are also discussed. The scheme of minimizing wall temperature measurement error is presented in the end.