The function of eustachian tube showed type A curve in 600 ears of 314 cases,type AD curve in 12 ears of 10 cases and type C curve in 26 ears of 22 cases.

• 314例6 0 0耳为A型曲线 ,10例 12耳为AD型曲线 ,2 2例 2 6耳为C型曲线 ,2例 2耳鼓膜小穿孔。