Abstract: This paper introduced a method of measuring heat transfer coefficient and dimensionless heat transfer temperature in transient film cooling measurements with liquid crystal,and through the uncertainties of heat transfer coefficient and dimensionless heat transfer temperature,analyzed the impact of dimensionless main flow temperature and dimensionless secondary flow temperature on two-parameters' uncertainties amplification parameters.The results indicate that,increasing the main flow temperature or increasing the difference between two measurements' secondary flow temperatures will decrease the uncertainties of heat transfer coefficient and dimensionless heat transfer temperature.