Abstract: The parameters of energy flow of primary producers (agricultural crop and weed), consumers (pests and their natural enemies) and decomposer (soil microbe, protozoan and saprozoite) in wheat-corn intercropping agroecosystem in Tibet of China were studied by field investigation and laboratory measurement.The results showed that the wheat-corn intercropping agroecosystem had high primary productivity and energy translation efficiency, and the degression rate of energy flow through food chain was also high.At each nutritive layer of this agroecosystem, relatively less energy was required to product unit energy, and degree of energy utilization of superior nutritive layer from lower nutritive layer was increased gradually.