Abstract: A study is conducted to analyze the organization and process of the feeding systems for an assembly line under the JIT philosophy. By using the field study method for an auto factory, the workflow analysis method is adopted to analyze the pattern of equipment and workforce needed in the material handling system. Based on the production planning, demands, packaging volume, and process analysis, a mathematic model is developed to quantify the labor intensity and estimate the capacity of equipment and workforce for each process in the multi model assembly line feeding systems. An example is presented to show the effectiveness of the proposed method.