This experiment was carried out to investigate the relationship between rumen which is performing fermentative digestion and omassum which is performing mechanical digestion their morphological characteristics of the Korean native goat. The results obtained are as follows: 1. The items investigated in rumen part were 27 of right and left length of rumen, upper and lower length of rumen, ingesta and stomach weight, stomach weight, rumen weight, and area, thickness (max.), weight, papilae width, papilae length of dorsal sac, caudal dorsal blind sac, and cranial dorsal blind sac parts, caudal ventral blind sac part, ventral sac part, and minimum thickness of dorsal blind sac, cranial dorsal blind sac, and cranial dorsal blind sac parts, causal ventral blind sac part, and ventral sac part. 2. The items investigated in omasum part were 14 of upper and lower length from Facies parletalis to Facies visceralis part (L.F.V.O), right and left length from superior dorsal extremitas (dorsal) to inferior ventral extremitas (ventral) part (L.S.LO), weight of omasum (W.O), area of omasum (A.O), number of the laminae (N.L.O), thickness of the omasum wall of dorsal part (T.O.D.O), thickness of the omasum wall of posterior side (T.O.P.O), thickness of the omasum wall of ventral part (T.O.V.O), width of the largest laminae (W.L.O), area of the largest laminae (A.L.O) weight of the largest laminae (W.L.A.O), width of the second large (middle) laminae (W.L.L.O), area of the second large (middle) laminae (A.S.L.O), and weight of the second large (middle) laminae (W.S.L.O). 3. Correlation coefficients were measured between traits of omasum and rumen: Papillae width and papillae length of rumen were not related to those of omasum. Thus, the dependence of omasum on feed quality; i.e. physical properties of feed, was suggested but the development of papillae was coasidered to be not significantly affected by the feed quality. 4. Among the traits of omasum observed, six traits, that is, W.O,A.O,T.O.P.O, A.L.O, W.L.A.O, and W.S. L.O were found to be closely related to those of rumen. 5. Correlation coefficients and regression equation between live weight and omasum weight was found to be Y = 4.903 + 0.288 X (r = 0.8349**) 6. Correlation coefficients and regression equation between chest girth and omasum weight was found to be Y = 44.855 + 0.311 X (r = 0.6722**) 7. Correlation coefficients and regression equation between omasum area, vs. dorsal sac, caudal dorsal blind sac, and cranial dorsal blind sac area (r₁), omasum area vs. caudal ventral blind sac area (r₂), and omasum area vs. ventral sac area (r₃) were r₁ = 0.7195** and Y＾ = 132.722 + 7.206 X, r₂ = 0.9473** and Y＾ = 28.714 + 2.850 X, and r₃ = 0.6447** and Y＾ = 34.016 + 4.672 X, respectively. 8. Correlation coefficients and regression equation between omasum weight vs. dorsal sac, caudal dorsal blind sac, and cranial dorsal blind sac weight (r₁), omasum weight vs. caudal ventral blind sac weight (2) and omasum weight vs. ventral sac weight (r₃) were r₁ = 0.8620** and Y＾ = 6.116 + 4.029 X, r₂ = 0.8444** and Y＾ = 1.837 + 0.851 X, and r₃ = 0.8235 ** and Y＾ = -4.975 + 2.361 X, respectively.