It is clinically well-known observation that nasal packing is associated with the Eustachian tube dysfunction, and seldom this study appeared in the literature. In our country, nasal surgery requiring nasal packing is still the most frequent operation in the field of otolaryngology and it is our interest to study this effects of nasal packing on the Eustachian tube function. Using tympanometry, we expierenced Eustachian tube dysfunction in 40 patients(80 ears) with anterior packing due to nasal surgery and epistaxis and in 13 patients(26 ears) with anterior packing and posterior packing due to epistaxis. The results were as follows ; 1) Thirty of the 80 ears (37.5%) in the patients with anterior packing revealed reduction in middle ear pressure, of which 16 ears(20%) demonstrated negative middle ear pressure of greater than 100mmH₂O. 2) Fifteen of the 26 ears(57.7%) in the patients with posterior packing revealed reduction in the middle ear pressure, of which 11 ears(42.3%) demonstrated negative middle pressure of greater than 100mmH₂O. 3) Posterior packing is associated with a greater incidence of Eustachian tube dysfunction than anterior packing. 4) Type B tympanogram was not found. 5) The Eustachian tube dysfunction associated with nasal packing is temporaly and this function is returned to normal within 2 to 9 days after removal of the packing.