Abstract: Objective To evaluate the value of magnetic resonance hydrography in the determination of the volumes of inner ear and internal auditory canal fluid. Methods Three-dimensional fast imaging employing steady state acquisition magnetic resonance images of thirty normal adults（sixty ears）were performed by using GE1.5T and eight-channel head coil, then sent to AW4.2 workstation to establish optimal observation plane using multiplanar reconstruction（MPR）and three-dimensional volume reconstruction，to measure the volumes of inner ear and internal auditory canal and establish a preliminary range of normal value. Meanwhile the volumes of inner ear and internal auditory canal with regard to gender, ear-side and age were analyzed respectively. Results The volumes and range of normal value of cochlea,semicircular canal-vestibule and internal auditory canal in thirty normal adults were (101.2±11.1)mm3 and (79.4-123.0)mm3,(151.5±19.9)mmSUP>3 /SUP>and (112.5-190.5)mmSUP>3/SUP>,(220.1±58.7)mmSUP>3 /SUP>and (105.0-335.2)mmSUP>3/SUP>, respectively.The coefficients of variation were 0.11,0.13 and 0.27, respectively. There was no significant difference among the volumes of inner ear and internal auditory canal with regard to gender, ear-side and age（EM>P/EM>＞0.05）.Conclusion Magnetic resonance hydrography may serve as a preferable objective measure for assessing the volumes of inner ear and inte

Key words: Magnetic resonance imaging, Inner ear, Internal auditory canal, Three dimensional volume reconstruction, Multiplanar reconstruction, Human