In order to improve the measurement efficiency of river ice thickness during the stable freezing period, the ice thickness measurement of the Shisifenzi bend in Inner Mongolia of the Yellow River was carried out by using the airborne radar, and the ice thickness was compared with the measured values of ice ruler. The results show that the thickness of the ice on the concave bank side is in the range of 50~90 cm, which is about 10~30 cm thicker than that on the convex side. The thickness of the ice on both sides of the free flow is consistent, with an average thickness of about 50 cm, and the closer to the free flow, the lesser the thickness of the ice. For the ice measurement effect of airborne radar, the flat seal ice sheet is the best(absolute error less than 5 cm), the vertical freeze-up ice sheet is the second, and the accumulation ice sheet is the worst. The standard deviation of the measured ice thickness between radar and ice ruler is 0. 039 4, and the random uncertainty is 7. 88%, satisfying the requirements of the ice thickness observation specification. The airborne radar can quickly measure the ice thickness in a large scale continuously, which greatly improves the test efficiency of ice thickness and can be applied to ice thickness tests during the stable freezing period of the Yellow River.