Digital holographic interferometry is used to measure the temperature distribution of airflow field.A fast Fourier transform followed by a digital low-pass filter and an inverse Fourier transform are applied to interference fringes for removing speckle noise,so that airflow field phase information is in high-contrast and low noise.Phase is unwrapped to calculate phase difference.The temperature distribution is obtained by the relation between phase and refractive index.The results are consistent with the values measured by thermocouple.It is shown that the digital holographic interferometry is an effective method for measuring temperature field and the measuring precision can be greatly improved.