Shambaugh and many other authors have written several articles relating to deafness and hearing impairment. In 1946, acoustic impedance of middle ear was firstly measured by Metz, and later, it was more actively studied by James Jerger and others. Accordingly we have measured the tympanogram, static compliance and stapedial reflex on the subject of 113 (226 ears) students of a deaf ranging in the age from 6 to 18 years. The results are as follows : 1) Of the hearing impairment, 213 ears (94.2%) were of the sensorineural type and 13 ears (5.8%) were of the mixed type in all deaf child. 2) The degree of hearing impairment was more than moderate : Moderate hearing loss 2 ears (1%), Moderate severe hearing loss 13 ears(6%), severe hearing loss 32 ears(14%), profound hearing loss in 26 ears(17%), and no response in 127 ears (58%), according to Goodman's classification. 3) Of 222 ears, except the perforated ear drums(4 ears), tympanogram type A was 204 ears(92%), tympanogram type B 14 ears(6.4%) and tympanogram type C 4 ears(1.7%). 4) The middle ear pressure in maximal compliance of tympanogram type A were noted as follows : 4.4% for-50mmH₂O to 100mmH₂O, 1.5% for 50mmH₂O to 0mmH₂O, 91.2% for 0mmH₂O and 2.9% for 0mmH₂O, to 50mmH₂O. 5) The range of static compliance of type A and C tympanogram were 0.10-1.76cc. The average static compliance in the population of the school for the deaf was 0.43cc, male averaging 0.42cc and female averaging 0.44cc. 6) The stapedial reflex were present in 9% of 213 ears of sensorineural hearing loss. 7) Average reflex sensation level in 500HZ is distributed from 50dB to 20dB and reflex sensation level declined proportionally to the degree of hearing loss relatively. 8) Otoscopic finding in 226 ears revealed 203 ears(89.8%) with normal ear drum, 10 ears(4.4%) with fluid level, 9 ears(4.0%) with drum retraction, and 4 ears(1.8%) with drum perforation.