The function of auditory tube is important to peoples who are engaged in the environment of hyper-baric pressure such as U.D.T., S.S.U. and other under-water employers. Although there has been several trials for auditory tube function, there is not any proven methods. So we tried to develop a new test methods for auditory tube function with Diving Simulator (Ocean System Japan) and Acoustic Impedance Meter (TA 1-D), and obtained following results: 1) The average of age was 24.4 years and static compliance was 0.58cc. 2) The frequencies of Toynbee's manuever to equalize middle ear pressure was 3.8 in average and 1.9 in standard deviation. 3) The grading of auditory tube function with reference to required Toynbee's maneuver was grade I : between 0 and 4 (142. 65.4%), grade II : between 5 and 6 (31. 14.2%), grade III : between 7 and 8 (22. 10.1%), grage IV : above 8 (22. 10.1%).