Abstract: Comparative experiments of a propeller with and without the antiicer have been completed in a wind tunnel.The analysis of the experimental data shows that the effect of the anticer depends on the advance ratio(J)and the blade angle(β).First,the antiicer has no effect on the performance of the propeller when the blade angle is big enough and the advance ratio is small(β=40°,J<0 5).Second,the efficiency of the propeller with antiicer increases when the blade angle is big enough and the J is moderate(β=40°,0 51 3)or at a smaller angle with a moderate ratio(β=27 5°,J>0 5).In fact,when aircraft is flying,its propeller is almost running at the third condition.When the airarft takes off(J=0 618,β=28 79°),the antiicer reduces the propeller efficiency by 1 5 percent,and by 3 percent when the plane cruises(J=1 6130,β=40 41°).