The aim of this paper is to estimate the long-term partial cost share in past 40 years (including the farm labor force, land and machine), using reconstructed data of the input and output tables for the Taiwanese agricultural industry. The author has focused on the adjustment of the capacity utilization variation by the short-run (shadow) cost theory and translog approximation's estimation. Empirical results find that the current cost share of farm labor steadily increases to the 30% and the current cost share of farm land gradually decreases to the 50%. In addition, the results also predict that the three partial cost shares will maintain even shares of the factor cost during the future one decade.