Based on the analysis of previous research results, A partial postponement strategy, which is a production mode with the combination of “make-to-stock” and postponement, is regarded as an appropriate strategy and should be implemented in the automobile manufacturers. A quantitative decision-making model is proposed in this paper. The proposed model, with customer waiting time as the constraint, aims to study the postponement probability which can minimize the total cost (including production cost, inventory cost and customer waiting cost). The application of partial postponement strategy in Corporation Q by the proposed model is analyzed in the next part of this paper. The results can help Corporation Q set its proper postponement probability to satisfy individual requirements at the lowest cost.