Abstract: Based on the theories and analytical methods of emergy, and adopting the indices such as net energy yield ratio, environmental loading ratio, energy density, energy consumption per capita, production cost ratio, sustainability index, system stability index, and dominance index, an analysis was made on the emergy structure of agroecoeconomic system in the reclamation area of Heilongjiang in 2002-2011. In the study area, all the indices mentioned above were maintained at a high level, the investment in industrial auxiliary energy was increased substantially, the production capacity of agroecosystem was continued to enhance, and the economic development level and the workers’ living standards were improved significantly. However, these improvements also induced the decline of agroecosystem sustainability, the irrational planting structure, and the low energy efficiency issues, which should be solved in the future development.

Key words: micro-irrigation, summer maize, yield., subsoiling, soil enzyme activity