For the purpose of discussing the current situation of resource consumption and environmental loading in grains supply system, a preliminary case study of life cycle analysis for grains production and transportation process both in Japan and Heilongjiang province of China is examined. In the paper, attempts are made to calculate energy consumption and CO2 emission throughout the life cycle of grain (wheat, rice, maize and bean) productions and transportations, which will provide basic data to evaluate the current situation of grains supply system.

As results of the examination, including data collection and compiling, the energy consumption and CO2 emission in grains supply system in Japan (3.9MJ/kg, in average of four grains, the same as the follows) is around twice as large as those in China (2.1MJ/kg). Although, the difference between energy consumption in production stage in Japan (2.5MJ/kg) and that in China (2.0MJ/kg) is small, quite large difference between energy consumption in transportation stage in Japan (1.4MJ/kg) and that in China (0.1MJ/kg) is found.