Abstract: To economically and productively develop production in reservoir or lake, the ETBWBis designed for comprehensive coordination of the relationship among the main elements in ecology and production of the broad water body (BWB) on its surface, in its shallow and deep layer as well as the aerial part above it, and for realizing a "Azolla-chicken-fish" production, in which the production is done under a stereo-constructive and optimized combined system. Its content, characteristics and effectiveness are involved by the following aspects: a "floating tray" technique for Azolla raising on the surface and a series of new measures concerned the Azclla culture were developed, some promissing Azolla species as a new feed resource suitable to fish and chicken are screened out and got a good yield as high as 495—547t·ha^-1·yr^-1; feeder fishes were raised in net pen from water surface down to 2.5m, a forecasting technique for reasonable use of the Azolla feeding fishes was developed, fish output was increased by 37.5—117.6%; in water filter feeder fishes were cultured and fed by the fish excrement from the net pen, thereby, the filter feeder fishes's yield was increased to 4.29 times; in the space above the net pen, a technique of poultry house for chicken farming was developed, in which chickens were fed with the Azolla, the body weight of the chickens increased 2.5—7.5% and concentrated feed was saved by 10—20%; manure of the chickens was applied to Azolla and fishes. Thus, a new industrywith less consumption of the land, feed, labour and energy about the BWBdevelopment was formed.

Key words: Broad water body, Ecological technique, Floating tray, Azolla, Fish culture with net pen, Chicken farming in the space above the net pen