The work aims to analyze the transport package cases so as to enhance protection and reduce the comprehensive cost of package. Based on the collection of numerous transport design cases, original and improved schemes were compared and the methods of structure optimization, material optimization, size optimization were summarized, covering all respects of transport optimal design. According to the actual case of enterprise, different optimization parameters were provided, such as product volume decreased by 34%, G value of corner drop decreased, cost of single package material reduced, product compact loading rate increased by 46% etc. In conclusion, three-step transport optimal design is put forward. It reduces quantity, volume and cost, improves efficiency and finally reduces the comprehensive cost.